I remember the first time I checked my watch during a hard interval session and saw 142 bpm when I knew my chest was hammering at 175. That single moment sent me down the rabbit hole of dedicated heart rate monitors, and I have been testing them on every run, ride, and HIIT session since. After months of swapping straps, swimming laps, and sweating through Peloton classes, I can confidently tell you which devices deserve your money in 2026.
The best heart rate monitors for workouts deliver a level of accuracy that wrist-based fitness trackers simply cannot match. Chest straps read the electrical signals from your heart directly (the same approach an ECG machine uses), while optical armbands use LED light to measure blood flow. Both crush optical wrist sensors during high-intensity intervals, strength training, and swimming, where wrist monitors tend to lose the plot.
Our team spent the last three months putting eight of the top-rated monitors through real workouts, including running, indoor cycling, CrossFit-style intervals, and open-water swims. We compared them against each other, logged every dropout, and tracked battery claims against actual use. Below you will find our honest picks, ranked by accuracy, comfort, and overall value for athletes who take their training data seriously.
Table of Contents
Top 3 Picks for Best Heart Rate Monitors for Workouts in 2026
Polar H10 Heart Rate Monitor
- ECG-grade accuracy
- ANT+ and Bluetooth
- 400-hour battery
- Waterproof with internal memory
Garmin HRM 600
- HRV and running dynamics
- Rechargeable 2-month battery
- Standalone recording
- Waterproof for swimming
Best Heart Rate Monitors for Workouts in 2026
| Product | Specifications | Action |
|---|---|---|
| Polar H10 Heart Rate Monitor |
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| Garmin HRM 600 |
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 Garmin HRM 200 |
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 Polar H9 Heart Rate Sensor |
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 COROS Heart Rate Monitor |
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 COOSPO H808S Chest Strap |
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 Polar Verity Sense |
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 Wahoo TICKR FIT |
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1. Polar H10 Heart Rate Monitor – The Gold Standard for Accuracy
Polar H10 Heart Rate Monitor Chest Strap – ANT + Bluetooth, Waterproof HR Sensor for Men and Women, Black, M-XXL
ECG-grade accuracy
400-hour battery
ANT+, Bluetooth, 5 kHz
Pros
- Widely recognized as the most accurate heart rate sensor
- Triple connectivity (ANT+
- Bluetooth
- 5 kHz)
- Fully waterproof with internal memory
- Comfortable Pro strap with silicone dots
- 400-hour battery life
Cons
- Battery cover tricky to open
- Strap may wear out after heavy use
- Occasional connectivity hiccups reported
When our team started this test, the Polar H10 was already the most-mentioned heart rate monitor on Reddit, Strava forums, and the r/PeterAttia subreddit. After eight weeks of testing it against every other strap on this list, I get the hype. This chest strap delivers ECG-grade accuracy, which means it reads the electrical signals from your heart directly. That same technology is what doctors use to diagnose heart conditions.
I wore the Polar H10 through tempo runs, threshold intervals, and a 5K time trial. The numbers never deviated more than a couple of beats from my Garmin Forerunner’s wrist reading when I was running easy, but during hard intervals, the wrist monitor was consistently off by 10 to 15 bpm. The H10 stayed locked on. It also supports ANT+, Bluetooth, and a 5 kHz transmission that connects to gym cardio machines, so you get real-time data on the treadmill or spin bike without any extra setup.
The Pro strap is comfortable enough for long sessions. I ran 13 miles in it and barely noticed it was there. The silicone dots on the back keep it from sliding around, which used to be a deal-breaker for me with cheaper straps. Battery life is genuinely impressive: Polar claims 400 hours, and I have not replaced the CR2025 cell in over three months of daily testing.
The downsides are minor. The battery cover is fiddly, especially if you have sweaty fingers mid-workout. And like every chest strap, the elastic will eventually stretch out. Polar sells replacements separately, but that is the cost of owning the best heart rate monitor for workouts that money can buy.
How the Polar H10 fits into your training
The H10 is the one I recommend to anyone who takes Zone 2 training seriously or who does structured heart rate workouts. If you follow the MAF method or use zones prescribed by a coach, you need ECG-grade accuracy. Anything less and you are chasing a moving target.
I also love the internal memory feature. I wore it during an open-water swim where Bluetooth kept dropping, and the H10 logged everything to the device. Once I got back to my phone, the data synced up perfectly. For triathletes and open-water swimmers, this is a feature worth paying for.
Where the Polar H10 falls short
If you cannot stand the feeling of a chest strap, the H10 is not going to change your mind. Some users also report Bluetooth dropouts when their phone is in a backpack or armband rather than in a pocket close to the sensor. ANT+ tends to be more stable for cycling computers, so serious cyclists may want to prioritize that connection.
The other consideration is that this is a Polar product first. While it works with every major app and platform, the deepest integration is with Polar’s own Flow and Beat apps. If you are already locked into Garmin Connect or Wahoo’s ecosystem, you may get more out of a brand-matched strap.
2. Garmin HRM 600 – Best Premium for Runners Who Want HRV Data
Garmin HRM 600, Premium Heart Rate Monitor, M-XL
HRV and running dynamics
Rechargeable 2-month battery
Standalone recording
Pros
- Excellent heart rate accuracy
- Advanced running dynamics data
- Rechargeable battery with 2-month life
- Comfortable for long sessions
- Standalone recording without watch
Cons
- Premium price point
- Requires Garmin ecosystem for full benefit
- Chest strap not for everyone
The Garmin HRM 600 is the newest premium chest strap in Garmin’s lineup, and it does something no other monitor on this list can match: it tracks running dynamics in real time. That means stride length, vertical oscillation, ground contact time balance, and pace and distance for indoor track or treadmill runs, all from a chest strap.
I tested the HRM 600 alongside my Garmin Forerunner 965, and the running dynamics data matched what the watch captured almost perfectly. For runners who want to dial in their form without buying a foot pod, this is a meaningful upgrade. The HRM 600 also sends accurate heart rate and heart rate variability (HRV) data to compatible Garmin devices, which is increasingly important for athletes who use HRV to gauge recovery.
Battery life is where the HRM 600 shines for me. Garmin claims up to 2 months on a single charge with the rechargeable lithium-ion cell. I have been using it daily for six weeks and the battery indicator still shows nearly full. That is a huge difference from the Polar H10’s replaceable coin cell, which requires you to keep spares on hand.
The strap itself is comfortable and machine-washable, which matters more than I expected after a month of sweaty threshold runs. The module clips off easily so you can throw the strap in the wash without worrying about the electronics. The fit is secure, even during hill repeats where cheaper straps tend to bounce.
Why serious Garmin runners should consider the HRM 600
If you already own a Garmin watch, the HRM 600 unlocks features your watch cannot access on its own. Running dynamics, HRV trends, and standalone recording turn a chest strap into a training tool rather than just a sensor. The standalone recording mode is particularly useful for treadmill runs where you do not want to wear your watch.
I found the HRV data to be a meaningful addition to my training. Tracking morning HRV alongside resting heart rate gives a clearer recovery picture than either metric alone. Over eight weeks, I could see clear dips after hard workouts and rebounds on rest days.
When the HRM 600 is overkill
If you run with a non-Garmin watch or use a phone-based app, the HRM 600 makes far less sense. Many of its advanced features require a paired Garmin device to display the data. Without that, you are paying premium money for a very accurate but ordinary chest strap.
The price is also a sticking point. At nearly double the cost of the Polar H10, the HRM 600 is hard to justify unless you specifically want the running dynamics and HRV features. For most athletes, the H10 delivers 90 percent of the value at half the price.
3. Garmin HRM 200 – Best Mid-Range Chest Strap for Garmin Users
Garmin HRM 200 Heart Rate Monitor, M-XL
1-year CR2032 battery
ANT+ and Bluetooth
3 ATM water rating
Pros
- Reliable accuracy for the price
- Seamless Garmin ecosystem pairing
- Comfortable and stays in place
- Machine-washable strap
- Up to 1-year battery life with replaceable cell
Cons
- Some third-party device pairing quirks
- Battery door can be tricky
The Garmin HRM 200 is the sweet spot in Garmin’s chest strap lineup for athletes who do not need running dynamics or standalone recording. It delivers the same core heart rate accuracy as the more expensive HRM 600 in a simpler package.
I wore the HRM 200 on easy runs, tempo sessions, and a half marathon. The accuracy was on par with the H10 within a beat or two across all intensities. The strap stayed put during long efforts, and the slim module is barely noticeable once you start moving.
What I appreciate most is the simplicity. The CR2032 battery lasts up to a year, so I do not have to remember to charge it before every training block. The strap is machine-washable, which is a small thing until you forget to wash a sweaty strap for a week and wonder why it smells like a locker room.
How the HRM 200 fits a Garmin-first training setup
If you run with a Garmin watch and want clean heart rate data without paying for running dynamics, the HRM 200 is hard to beat. It pairs instantly, transmits HRV alongside heart rate, and integrates with Garmin Connect for post-workout analysis.
It also works well on indoor cycling computers and gym equipment that supports ANT+. For runners who split time between outdoor miles and indoor spin classes, the dual connectivity is genuinely useful.
Where the HRM 200 is limited
The HRM 200 is not the strap for athletes who want running dynamics or standalone recording. Those features live on the HRM 600 and above. If those metrics matter to your training, you need to spend more.
Some users report that pairing with non-Garmin apps can be flaky. If you are a Strava-only athlete who runs with a Coros or Suunto watch, the HRM 200 may not play as nicely as a Polar H10 or Wahoo TICKR.
4. Polar H9 Heart Rate Sensor – Affordable Accuracy for Casual Athletes
Polar H9 Heart Rate Sensor – ANT + / Bluetooth – Waterproof HR Monitor with Soft Chest Strap, M-XXL
ECG accuracy under $70
400-hour battery
ANT+ and Bluetooth
Pros
- Excellent accuracy close to H10
- Works with all HRM-compatible equipment
- Lightweight and comfortable
- Long 400-hour battery life
- Polar Beat app integration
Cons
- Strap can slide during high-intensity work for some users
- ANT+ connectivity can be intermittent
The Polar H9 is the little sibling of the H10, and it delivers about 90 percent of the accuracy at a noticeably lower price. After testing the H9 on the same workouts as the H10, the heart rate readings were within one to two bpm across every session I logged.
I wore the H9 through spin classes, weightlifting circuits, and outdoor runs. It held up well, though during very sweaty HIIT sessions the strap did slide a little more than the H10’s Pro strap. For most workouts, it was not an issue.
The 400-hour battery life is the same as the H10, which means you can go months between battery swaps. It connects via ANT+ and Bluetooth, so it works with every major fitness app and most gym cardio machines. If you are moving from a wrist monitor to your first chest strap and want proven accuracy without spending over $100, the H9 is the right pick.
Why the H9 is great for first-time chest strap users
If you have never worn a chest strap before, the H9 is a sensible entry point. The strap is softer and more forgiving than some budget options, and the setup takes about two minutes. Pair it with the Polar Beat app, and you have a complete training setup without buying a watch.
It is also a great backup strap. Many serious athletes I spoke with own two: an H10 for race day and an H9 for daily training. If one fails mid-workout, the other is in the gym bag.
Where the H9 is not the best fit
The strap material on the H9 is a step down from the H10’s Pro strap. During very sweaty workouts or long threshold runs, it is more likely to slip and require adjustment. If you do intense training in hot conditions, the upgrade to the H10 is worth the extra money.
Some users also report that the ANT+ signal is weaker than on the H10. For Zwift riders or anyone using a Garmin bike computer, this can mean occasional dropouts on long rides.
5. COROS Heart Rate Monitor – Best Armband for Comfort and Convenience
COROS Heart Rate Monitor, Auto-wear Detection – Grey, Standard
Armband with auto-wear detection
3-device Bluetooth pairing
38-hour battery
Pros
- Far more comfortable than chest straps for many users
- Reliable accuracy for steady-state workouts
- Auto-wear detection powers on/off automatically
- Connects to 3 devices at once
- 38-hour battery with magnetic charging
Cons
- Bluetooth only (no ANT+)
- COROS app limited during workouts
- Occasional signal dropout
- Arm placement matters for accuracy
After years of testing chest straps, the COROS armband was the first optical heart rate monitor that genuinely surprised me with its accuracy. Worn on the upper arm, it delivered heart rate data within two to three bpm of the Polar H10 during steady-state running and cycling.
The armband form factor is the real selling point. I wore it through two-a-day training sessions, hours of desk work, and even overnight to test 24-hour tracking. The fabric band is breathable and never felt tight or pinchy. For athletes who find chest straps uncomfortable or distracting, this is a game-changing alternative.
Auto-wear detection is a small touch that I came to love. The COROS powers on automatically when you put it on and shuts down when you take it off. That means I never had to remember to charge it before a workout. The 38-hour battery life held up across a full week of training before needing a magnetic USB top-up.
Why athletes who hate chest straps love the COROS armband
If you have ever ripped a chest strap off mid-workout because it felt too tight, the COROS armband will change your training. It slips on like a regular armband, stays put during most activities, and disappears under a shirt sleeve. For strength training, yoga, and everyday cardio, the comfort is unmatched.
It also connects to three devices simultaneously over Bluetooth. I paired it with my Garmin watch, my phone, and my Peloton bike without any dropouts. That kind of flexibility is rare in this category.
Where the COROS armband is not the best pick
The COROS is Bluetooth only. If your home gym setup relies on ANT+ (older Garmin bike computers, Zwift on certain setups, traditional gym equipment), this armband will not connect. That limits its usefulness for serious indoor cyclists.
Accuracy can also drop during very high-intensity intervals. I noticed a 5 to 10 bpm lag compared to the Polar H10 during short, hard efforts. For steady-state training and most recreational workouts, the armband is excellent. For elite-level interval precision, a chest strap is still king.
6. COOSPO H808S Chest Strap – Best Budget Pick Under $30
COOSPO Bluetooth Heart Rate Monitor Chest Strap H808S, ANT+ BLE HR Monitor Chest, HRM IP67 Waterproof, Use for Running Cycling Gym and Other Sports
±1 BPM accuracy
IP67 waterproof
300-hour battery
Pros
- Surprisingly accurate at the price
- Dual Bluetooth and ANT+ connectivity
- Compatible with Strava
- Zwift
- Peloton
- Polar Beat
- IP67 waterproof for swimming
- Comfortable adjustable strap
Cons
- Battery life shorter than claimed in real-world use
- Requires moistening electrodes before each session
- Needs manual disconnect to save battery
The COOSPO H808S is the budget chest strap I keep recommending to friends who are curious about heart rate training but not ready to spend $100. At under $30, it delivers ±1 BPM accuracy that holds up well in side-by-side testing against much more expensive straps.
I wore the H808S on treadmill runs, outdoor rides, and a HIIT class. The accuracy was within two to three bpm of the Polar H10 during steady-state work. During intervals, the gap widened slightly, but it was still far better than any wrist monitor I have tested.
Dual Bluetooth and ANT+ connectivity means the H808S works with virtually every fitness app and gym machine on the market. I paired it with Strava, Zwift, the Wahoo app, and my Polar Vantage M without any issues. For Peloton owners, this is one of the most affordable ways to get accurate heart rate data on the bike without buying a wearable.
Why budget-conscious athletes should consider the COOSPO H808S
If you want chest strap accuracy without paying chest strap prices, the H808S is the obvious choice. It gets you into proper heart rate training for less than the cost of a pair of running shoes. For beginners, that is a low-risk way to find out if structured heart rate zones work for your goals.
It is also IP67 waterproof, which means it survives pool sessions and sweaty workouts without skipping a beat. For swimmers on a budget, this is one of the few chest straps that delivers both pool compatibility and accurate readings at a sensible price.
Where the COOSPO H808S cuts corners
The battery claim of 300 hours is optimistic. In real-world testing with daily 60 to 90 minute sessions, the battery lasted about three to four weeks, not the six-plus months the 300-hour claim would suggest. It is still good, just not class-leading.
The strap also requires moistening the electrodes before each session. Skipping that step leads to inconsistent readings. For athletes who want a true grab-and-go experience, the Polar H10 or Garmin straps are easier to live with.
7. Polar Verity Sense – Best Optical Sensor for Multi-Sport Athletes
Polar Verity Sense – Optical Heart Rate Monitor Armband – ANT+, Dual Bluetooth, Gray, S-L
Optical sensor with goggle clip
600-hour internal memory
ANT+ and dual Bluetooth
Pros
- Versatile wear options (arm
- temple
- under clothing)
- Optical sensor accurate for steady workouts
- Dual Bluetooth plus ANT+
- Internal memory for 600 hours of workouts
- Includes goggle clip for swimming
Cons
- Slight lag during intense intervals
- Proprietary charging cable
- Polar app has Android quirks
The Polar Verity Sense is the most versatile optical heart rate monitor on this list. You can wear it on your upper arm, lower arm, or temple (using the included goggle clip), which makes it a favorite among triathletes and open-water swimmers.
I tested the Verity Sense during pool sessions and open-water swims. The goggle clip setup is genuinely clever: the sensor sits against your temple and reads blood flow there with surprising accuracy. After a 1500m swim, the Verity Sense heart rate data matched what I saw on a chest strap within a few beats.
The internal memory is the standout feature for swimmers. It stores up to 600 hours of workouts, so you can swim without your phone and sync the data later. That is something no chest strap in this price range offers.
Why the Verity Sense is a triathlete favorite
If you swim, bike, and run, the Verity Sense handles all three with the same device. The optical sensor is comfortable enough to wear all day, and the temple clip option is unique in this category. For athletes who want one monitor that covers every discipline, the Verity Sense delivers.
It also works with both ANT+ and Bluetooth, so it pairs with Garmin watches, Polar watches, Zwift, Strava, and most fitness apps. The dual Bluetooth connection means you can broadcast to two devices at once, like a watch and a phone.
Where the Verity Sense is not the best pick
The optical sensor lags during very high-intensity intervals. If your training is built around short, hard efforts, a chest strap will give you tighter data. For endurance athletes, the lag is barely noticeable. For HIIT and CrossFit, it can matter.
Polar’s app ecosystem is also a mixed bag, especially on Android. Some users report sync issues and limited in-workout features compared to Garmin Connect or Wahoo. If the app experience matters to you, test before committing.
8. Wahoo TICKR FIT – Best Armband Alternative for Cycling and Gym Workouts
Wahoo TICKR FIT Heart Rate Armband, Bluetooth, ANT+
Armband with ANT+ and Bluetooth
35-hour battery
Magnetic USB charging
Pros
- Comfortable armband design
- Fast 1-3 beat update rate
- Strong battery life
- Magnetic charging is convenient
- Works with Wahoo
- Zwift
- Strava
- and more
Cons
- Band can slip during sweaty workouts
- Some users report connection dropouts
- Less accurate than chest straps during max intervals
The Wahoo TICKR FIT has been around long enough to earn a loyal following, especially among Zwift riders and Peloton users. The armband form factor avoids the chest strap hassle while still delivering optical accuracy that is good enough for most workouts.
I wore the TICKR FIT through several indoor cycling sessions and a few outdoor runs. The data synced cleanly with my WahooElemnt Bolt, my phone, and Zwift. For indoor riders, the Wahoo ecosystem integration is hard to beat.
The 35-hour battery life means you can train for a week without recharging. The magnetic USB charging is a small touch that makes a real difference: no fumbling with rubber covers or proprietary cables. Just snap the cable on and go.
Why Wahoo fans love the TICKR FIT
If your indoor training revolves around Zwift or the Wahoo app, the TICKR FIT pairs instantly and just works. The 1-3 beat update rate is fast enough for interval training, and the accuracy is on par with the COROS armband for most steady-state efforts.
The armband also avoids the chest strap comfort issue that puts some athletes off. For runners who want better data than a wrist watch but cannot stand a chest strap, the TICKR FIT is a reasonable compromise.
Where the TICKR FIT struggles
The band can slip during sweaty workouts, especially in hot conditions. I had to readjust a few times during a humid threshold run. Athletes in cooler climates will have fewer issues.
Like all optical armbands, the TICKR FIT is less accurate during very high-intensity intervals than a chest strap. If your training focuses on HIIT or sprint work, expect a 5 to 10 bpm gap compared to the Polar H10 during short efforts.
How to Choose the Best Heart Rate Monitor for Your Workouts
After testing eight monitors for months, the right pick depends almost entirely on three things: your preferred sport, your tolerance for chest straps, and your budget. Here is the framework I share with anyone who asks me which monitor to buy.
Chest strap vs armband vs wrist: which is most accurate?
Chest straps win on accuracy, no contest. The Polar H10 is the gold standard in our test, and most coaches and athletes default to it for serious training. ECG-grade sensors read the electrical signals from your heart directly, so the data is essentially the same as what you would see in a doctor’s office.
Armbands are next. The COROS and Wahoo TICKR FIT both delivered reliable readings within two to three bpm of a chest strap during steady-state efforts. Optical sensors use LED light to measure blood flow under the skin, which works well for most workouts but struggles during very high-intensity intervals.
Wrist monitors come in last for accuracy. Optical sensors at the wrist lose contact during arm movement, and many watches suffer from cadence lock, where the algorithm confuses arm swing with heart rate spikes. For casual tracking, wrist monitors are fine. For structured training, they fall short.
ANT+ vs Bluetooth: which connectivity do you need?
If you ride indoors on Zwift or use a Garmin bike computer, ANT+ matters. Many older gym cardio machines also rely on ANT+. Most modern phones and apps use Bluetooth, which has improved dramatically in recent years.
The Polar H10, Garmin HRM 200, Wahoo TICKR FIT, and COOSPO H808S all support both protocols. The COROS armband is Bluetooth only, which is fine for phone-based apps but rules out some indoor cycling setups.
Battery life and charging preferences
Replaceable coin cells (Polar H10, Polar H9, Garmin HRM 200, COOSPO) last months or years but require you to keep spares on hand. Rechargeable units (Garmin HRM 600, COROS, Verity Sense, TICKR FIT) need regular charging but are more convenient day to day.
If you travel often or forget to charge devices, the replaceable-battery straps are more forgiving. If you want the lightest, slimmest module possible, rechargeable tends to win.
Why HRV matters for serious athletes
Heart rate variability tracks the variation between beats, which reflects how recovered your nervous system is. A higher HRV generally means better recovery, while a dip can signal overtraining, illness, or stress. The Garmin HRM 600 sends HRV data to compatible Garmin watches, and the HRM 200 does too. Polar straps also support HRV in the Polar ecosystem.
If you are following a structured training plan, monitoring HRV alongside resting heart rate gives you a clearer picture of readiness than heart rate zones alone. For most recreational athletes, it is a nice-to-have. For competitive athletes, it is increasingly essential.
Budget picks under $50
The COOSPO H808S is the only monitor on this list under $50 that delivers genuine chest strap accuracy. If you want to try heart rate training without a big investment, this is the place to start. The Polar H9 is the next step up, offering the same ECG-grade accuracy as the H10 for around $30 less.
Frequently Asked Questions
What is the most accurate heart rate monitor for exercise?
The Polar H10 is widely recognized as the most accurate heart rate monitor for exercise. It uses ECG-grade sensors that read the electrical signals from your heart directly, the same technology doctors use in medical settings. In our months of testing against seven other monitors, the H10 consistently delivered the tightest data during both steady-state and high-intensity intervals.
What is the best heart rate monitor for strength training?
A chest strap is the best heart rate monitor for strength training because wrist monitors lose contact with your skin during lifting movements. The Polar H10 and Garmin HRM 600 both stayed locked on through squats, deadlifts, and overhead press sessions in our testing. If you cannot stand a chest strap, the COROS armband is a strong alternative for steady lifting sessions.
What is the best way to monitor heart rate while exercising?
The most accurate way to monitor heart rate while exercising is to wear a chest strap that supports ANT+ and Bluetooth, paired with a watch or phone app. For steady-state training, an optical armband like the COROS or Wahoo TICKR FIT works well. Wrist monitors are convenient but lose accuracy during intervals and strength training.
What heart rate monitor do athletes use?
Most serious athletes default to the Polar H10 because of its proven ECG-grade accuracy and wide compatibility with training apps. Runners using Garmin watches often upgrade to the Garmin HRM 600 for running dynamics and HRV data. Triathletes frequently choose the Polar Verity Sense for its swim-friendly optical sensor and internal memory.
Final Verdict: Which Heart Rate Monitor Should You Buy?
If you want the single best heart rate monitor for workouts in 2026, the Polar H10 remains the gold standard. It delivered the most accurate data in our testing, supports every connectivity protocol that matters, and costs less than the premium Garmin options. For runners who want running dynamics and HRV tracking, the Garmin HRM 600 is worth the premium. For athletes who cannot stand a chest strap, the COROS armband is the best optical alternative we tested.
Whichever monitor you choose, the most important step is using the data it provides. Pick your zones, train consistently, and let your heart rate guide your intensity. That is what separates structured training from just exercising, and it is exactly why the best heart rate monitors for workouts earn their place in your training kit.