- Snap electrodes built into the band, 45 mm apart
- Works with Frontier, Garmin HRM, Polar H7 and more
- Breathable mesh, padded non-slip straps, seam-free lining
Colour: Black
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- Delivered in 3–5 business days
- 7-day hassle-free replacement
- Refund if it doesn't fit your monitor
Product Details
- Integrated electrodes with standard snaps, 45 mm apart.
- Comfortable fit for strap-free heart-rate monitoring.
- ECG-based accuracy for workout heart-rate data.
- Secure, breathable design with padded, non-slip straps
- Breathable mesh panels and fabric inserts.
- Flexible use with or without a compatible heart-rate monitor.
Compatibility
- Compatible: Frontier X, X2, X3, Zone, and most Garmin HRM monitors, Wahoo Tickr (1st & 2nd Gen), Polar (H7 & older), Mo-Fit, Powr Labs, Coospo and other monitors with standard snaps 45 mm apart.
- Non-compatible: Polar H9 and H10, Garmin HRM 600, Garmin HRM-Tri, Wahoo Tickr (3rd gen, 2020), MyZone, Peloton.
Material and Care
Material: 90% nylon, 10% spandex.
Hand wash or machine wash on a gentle cold cycle. Don't use bleach or fabric softener. Air dry.
Delivery and Returns
- Delivered in 3–5 business days.
- 7-day hassle-free replacement from the delivery date!
If you're not sure it fits your monitor, email support@fourthfrontier.com before you order.
As featured in
The chest strap is built into the bra
The electrodes sit in the underband. Clip on your monitor, then run, ride or lift with nothing extra to wear.
- 45 mmstandard snap spacing
- 3 sizes23 to 32 in bust
- 7 dayshassle-free replacement
Built around the electrodes
Tap a point to see what each part does.
- 1Wide padded straps
Non-slip and cushioned, so they stay put on long runs.
- 2Breathable mesh insert
Lets heat out at the centre of the chest, where you sweat most.
- 3Seam-free lining
Soft on the inside, with nothing to rub or chafe.
- 4Snap electrodes, 45 mm apart
The standard spacing most snap-on monitors use, including Frontier X2 and Zone.
- 5Wide underband
Holds the electrodes against your skin for a steady signal.
Made for training with a heart rate monitor
Breathable where you sweat
Mesh panels and fabric inserts help you stay cool through hard sessions.
Support for every session
From easy runs to high-impact training, with a band that doesn't ride up.
Racerback that stays put
The back keeps the band level, so your monitor stays where it reads best.
Built for frequent washes
Made to last through regular wear and washing.
Works with the monitor you already own
If your heart rate monitor clips onto two standard snaps 45 mm apart, it fits this bra.
Works with
- Frontier X, X2 X3, and Zone
- Most Garmin HRM monitors,
- Wahoo Tickr (1st and 2nd-gen),
- Polar H7 and older,
- Coospo, Mo-Fit, Powr Labs
Doesn't fit
- Polar H9 and H10,
- Garmin HRM-600 and HRM-Tri,
- Wahoo Tickr, 3rd gen (2020),
- MyZone, Peloton
Pick a size, Snap on, Train
- 1Pick your size
Three sizes, 23 to 32 inches.
- 2Snap on your monitor
Press it onto the two snaps on the band.
- 3Train as usual
Wear it with or without the monitor.
Size guide
| Size | Bust | Cup sizes |
|---|---|---|
| Small | 23–26 in58–66 cm | 70A, 70B, 70C, 75A, 75B, 75C, 80A |
| Medium | 26–28 in66–71 cm | 70D, 75D, 80B, 80C, 80D, 85A |
| Large | 28–32 in71–81 cm | 85B, 85C, 85D, 90A, 90B, 90C, 90D |
How to measure
- 1. Wear a well-fitting bra.
- 2. Wrap the tape around the fullest part of your bust, parallel to the floor.
- 3. Keep it snug but not tight, then read the number.
Questions about fit? Email support@fourthfrontier.com before you order.
The details
(Heart rate monitor not included)
| Specification | Frontier HRM Sports Bra |
|---|---|
| Fabric | 90% nylon, 10% spandex |
| Electrodes | Two snap electrodes, 45 mm apart, in the underband |
| Sizes | Small 23–26 in · Medium 26–28 in · Large 28–32 in (bust) |
| Colour | Black |
| Works with | Frontier X2, Frontier Zone and most monitors with 45 mm snaps |
| Care | Hand wash or gentle cold machine wash. Air dry. |
| Delivery | 3–5 business days |
| Returns | 7-day replacement. Refund if it doesn't fit your monitor. |
“No need to adjust or fiddle with it during your workout.”
“Once you wear the bra, there's no need to adjust or fiddle with it during your workout. It makes sure your device stays in place, even during high-intensity workouts.”
“The standout feature is the exceptional comfort. The padded design provides ample support and cushioning, making it ideal for high-impact activities.”
“It's incredibly comfortable and provides clear ECG data and analytics, enhancing my experience with the Frontier X2 device.”
“I liked the basic style, coverage and the fabric. The wireless bra is just perfect for gym and other physical activities.”
Two ways to wear your monitor
HRM Sports Bra
HRM Chest StrapComplete your setup
Total for
Explore Frontier Zone or Frontier X3
Questions, answered
What is a heart rate monitor (HRM) sports bra?
A heart rate monitor sports bra is a specially designed sports bra that includes a built-in mechanism or attachment point for securely holding a heart rate monitoring device during exercise.
How does the monitor attach?
Two snap electrodes sit on the underband, 45 mm apart. Press your heart rate monitor onto them and it's held in place. Unclip it after your workout.
Which heart rate monitors does it work with?
Frontier X, X2 X3, and Zone, most Garmin HRM monitors, Wahoo Tickr (1st and 2nd gen), Polar H7 and older, Coospo, Mo-Fit, Powr Labs and other monitors with standard snaps 45 mm apart.
It doesn't fit monitors with recessed snaps: Polar H9 and H10, Garmin HRM 600, Garmin HRM-Tri, Wahoo Tickr (3rd gen, 2020), MyZone and Peloton.
What are the benefits of using a HRM sports bra?
The main benefit is convenience – having your heart rate monitor securely attached to your sports bra eliminates the need for additional straps or accessories during workouts. It also ensures accurate heart rate tracking and allows you to focus fully on your exercise routine.
Is the sports bra comfortable to wear during exercise?
Our sports bras prioritise comfort with sweat-wicking, breathable materials, ensuring optimal airflow and moisture management during physical activity. Adjustable features and supportive designs guarantee a comfortable fit for every level of exercise.
How do I find my size?
Measure around the fullest part of your bust and check the size guide. Sizes run from Small (23–26 in) to Large (28–32 in).
Can I wear it without a monitor?
Yes. It's a supportive sports bra on its own. Just leave the monitor off.
How do I wash it?
Hand wash, or machine wash on a gentle cold cycle. Don't use bleach or fabric softener, and let it air dry.
Can I exchange or return the HRM sports bra ?
Yes, Enjoy a 7-day hassle-free replacement from the date of delivery. Please contact our customer support at support@fourthfrontier.com for assistance .
Where can I get a heart rate monitor?
All Frontier devices clip straight onto the bra, including the Frontier Zone and Frontier X3, which record continuous ECG and provide real-time vibration alerts, ensuring unparalleled accuracy.
Ready for strap-free training?
- Delivered in 3–5 business days
- Fits Frontier devices & most snap-on monitors
- 7-day hassle-free replacement