John Bruno, Ultra trail-runner, ski mountaineer
Makes my watch just a bit more accurate! Long battery life and simple design.
Recommended in Trail running
Brand: COROS
Category: Running Heart Rate Monitors
Recommended by Kilian Korth, Professional Trail Runner — Western Colorado
Highlights: comfortable
The COROS Heart Rate Monitor is a cutting-edge fitness accessory designed to provide accurate heart rate tracking for athletes and fitness enthusiasts. With its advanced technology and user-friendly interface, it empowers users to optimize their training and achieve their fitness goals. 1. Accurate heart rate monitoring with advanced optical sensors for real-time data. 2. Bluetooth and ANT+ connectivity for seamless integration with various devices and fitness apps. 3. Lightweight and comfortable design, making it ideal for extended wear during workouts. 4. Long-lasting battery life, providing up to 30 hours of continuous use on a single charge. 5. Waterproof rating of IP68, ensuring durability and performance in various weather conditions. 6. Customizable heart rate zones to help users tailor their training intensity. 7. Compact size (dimensions: 4.5 x 3.5 x 1.5 cm) for easy portability and storage. The COROS Heart Rate Monitor is perfect for athletes and fitness enthusiasts looking to enhance their training regimen. It excels in various environments, from indoor gyms to outdoor running trails, making it suitable for all skill levels. Ideal for tracking heart rate during high-intensity workouts, endurance training, or casual exercise, this monitor is a reliable companion year-round, regardless of the season or weather conditions.
Price: $89
Much more comfortable than a chest strap and very accurate.
Recommended by Kilian Korth, Professional Trail Runner
Runners, cyclists, and multi-sport athletes who want more accurate HR data than wrist-based sensors provide, without the discomfort of a chest strap. Hosts with small wrists, cadence-lock issues, or chafing problems from chest straps call it a direct fix.
Near-universal praise for comfort (hosts repeatedly say they forget it's on), accuracy, long battery life, and easy pairing with both COROS and Garmin devices. Two hosts flag a ~1-second data delay versus chest straps, and one notes it's unreliable for very short or immediate-start efforts.
One coach reports tattoos can interfere with the optical sensor and typical lifespan is around 24 months. The optical design eliminates wet-contact and battery-swap issues common with chest straps, and low-battery alerts push to paired watches and phones.
Much more comfortable than a chest strap and very accurate.
Kilian Korth recommends the COROS Heart Rate Monitor for running heart rate monitors. Much more comfortable than a chest strap and very accurate.
Yes — Kilian Korth recommends the Heart Rate Monitor by COROS as their running heart rate monitors pick. Much more comfortable than a chest strap and very accurate.
31 experts recommend the COROS Heart Rate Monitor.
Makes my watch just a bit more accurate! Long battery life and simple design.
Recommended in Trail running
SO comefy and effective. I got my coros arm band when I wanted a backup for my chest strap monitor. (like three years ago) And I never went back. Slight (~1sec) delay from chest strap (because the arm band is optical vs. detecting the heart's electrical activity) but the numbers line up and the arm band is so so much more comfortable that the slight delay is absolutely worth it.
Recommended in CCC by UTMB
This arm band changed the Heart Rate game for me. Chest straps never worked, I felt constircted and chaffed. When Coros brought this band out, it allowed me to trust and use HR data again. The data seems very accurate, only with a small delay (meaning it's not reliable for very short efforts or immediate feedback starting an effort). This is the go-to option for people I coach. Only issues have been with tattoos, and they tend to last ~24 months.
Recommended in Gear
I’ve been using this HR monitor for over a year now and I love it because it doesn’t chafe like my previous chest strap HR monitor. It’s rechargeable and I only have to charge it every week and a half or so! It’s great for running, biking, yoga, paddle boarding, skinning.. the list goes on!
Recommended in Training Gear
Data,Data,Data
Recommended in Broken Arrow 46k
The only HR monitor I'll actually remember to use!
Recommended in 10 Products I Actually Use Every Day
Data is incredibly important in this sport, and making sure you’re taking full advantage of it is huge.
Recommended in All the gear I trust on the daily!
A convenient heart rate monitor that fits perfectly around my upper arm. Extremely accurate for the most reliable heart rate data. Never even notice it!
Recommended in Trail Running Gear
Pretty much as accurate as the Polar H10 without the discomfort of wearing a chest strap. Forget I'm even wearing it.
Recommended in Javelina Jundred 100M
Best accuracy/comfort heart rate monitor I have used.
Recommended in 10 Products I Actually Use
I work a lot off of heart rate in my training. This is my favorite product for that. It's comfortable to wear on the arm and is very accurate. It pairs with all my COROS watches and is reliable.
Recommended in Products I Actually Use
I wore chest strap HRMs for years and always had issues with them. I hated always having to keep the contacts wet, and it seems like every time I had to change a battery, the sensor would stop working. Enter the Coros armband HRM! So easy to pair with my Garmin and the PM5 monitors on my Concept 2 ergs, and it's optical so no contacts to worry about. Battery life is excellent, and I get a notification on my Garmin and my phone when it needs to be charged. Plus, it's super comfortable and the strap us easy to clean. I also love that it's rechargeable. I will never go back to using a chest strap again!
Recommended in 10 Products I Actually Use
This gift will guarantee to raise their heart rate up with how happy they will be! Good thing they will be able to measure it accurately
Recommended in Christmas Gifts for Trail and Ultra Runners!
Big data fan and this HRM is unmatched
Recommended in Broken Arrow 46k
I'll be gauging my running by effort but it's always helpful to have accurate HR data along the way
Recommended in Jundred mile debut 🌵
I use the COROS Heart Rate Monitor to get a more accurate picture of my effort, especially during long runs and ultra training. It helps me keep an eye on heart rate, effort and pacing so I can better understand what my body is actually doing—not just what my pace says.
Recommended in 10 Products I Actually Use
1,000x better than wearing a chest strap and also way more accurate than wrist based HR
Recommended in Pinhoti 100!
I promise you won't even notice you're wearing it. I'm not really a data nerd when it comes to my running, but when it's this easy to collect HR date, why not?
Recommended in Everyday Faves
Wear on every run.
Recommended in The Items I ACTUALLY Use and Love!
Best on the market.
Recommended in Long Run Adventure Kit
The Coros HR Monitor was a game changer for me as I can finally leave the pesky chest strap behind. It feels so freeing to not wear a chest strap but also have accurate HR readings.
Recommended in Products I Actually Use
Nerds like me need data. And I will never awkwardly adjust a chest HR strap around a sports bra ever again thanks to this delightful product. The studies have been done, yes it's within the same margins of error as a chest strap. Just make the shift already and be a happier data nerd/accurate collector of HR data.
Recommended in Tech/Gadgets
Pairs directly with my COROS PACE 4, and I find it a lot more comfortable than wearing a chest strap. I like having more consistent heart rate data, especially on longer runs when I'm trying to keep my effort under control.
Recommended in My 50-Mile Race Kit
Most accurate heart rate. Is the best friend to my Garmin watch- they’re BFFLs
Recommended in 10+ Products I Actually Use
For the most accurate heart rate feedback, I use the Coros heart rate arm band. I forget I have it on when I'm racing, and end up with the best feedback when analyzing my effort.
Recommended in My 2025 AC100 Run
Reliable heart rate sensing vs. your traditional watch
Recommended in Trail Running Essentials
It's really nice to have accurate heart rate data during training and races. Seamlessly connects to my garmin and it's so comfortable I forget I'm wearing it.
Recommended in Run Rabbit 100
This completely changed the game for me. It’s super accurate and lets me lock in my pacing effortlessly for workouts and recovery days. It is incredibly more accurate than relying on a wrist based heart rate.
Recommended in 10 Products I Actually Use
I'm so glad I got myself this heart rate armband. It pairs easily with my watches, and as far as I can tell, the HR data is accurate. It is definitely far more accurate than just using my watch to read HR via the wrist (I have small wrists, and watches don't sit very flush). Using this armband ensures my watch doesn't "cadence-lock," which is a phenomenon that occurs when a watch interprets the impact of your running cadence as HR, skewing the workout data with incorrect values. Cadence lock can happen if a watch isn't flat against the skin or if your skin temperature drops too much due to cold weather. The COROS armband has avoided these issues altogether in my experience. The battery life is decently long, and the Bluetooth tech makes it easy to pair. I've enjoyed the orange color, as dirt and sweat won't show up as easily. I definitely recommend colors that won't highlight the grime of training! Plus, it's easy to detach the band for washing. I also like how relatively small/lightweight the HR monitor is.
Recommended in 10 Products I Actually Use
Fantastic HR monitor. Easy to use, comfortable, great battery life, and real-time updates.
Recommended in 10 Products I Actually Use
“Much more comfortable than a chest strap and very accurate.”
“Much more comfortable than a chest strap and very accurate.”
