Coros straps and accessories
As a Coros user, you know that every detail counts during a long training session or race. The watch strap isn’t just an aesthetic detail; it’s the feature that ensures the optical heart rate sensor rests firmly against your skin, whether you’re tackling a technical trail or grinding out intervals. An incorrectly fitted strap can cause the watch to bounce, which risks the sensor picking up your stride rate (cadence lock) instead of your actual heart rate.
Weight and sensor contact: Nylon vs. Silicone
For those of you who use the Coros Pace series and prioritise keeping your kit as light as possible, a woven nylon strap with a Velcro fastening is often the superior choice. The nylon strap allows you to fine-tune the fit to the millimetre, meaning the watch stays rock-solid even when your wrist swells during an ultramarathon, whilst the material allows your skin to breathe.
If, on the other hand, you train for triathlons, swim frequently or spend time in muddy environments, then the silicone strap is the most reliable option. Silicone repels moisture instantly, doesn’t chill your wrist after a swim session, and is incredibly easy to wipe down before the transition to the bike. Furthermore, the natural friction of silicone provides an excellent grip on wet skin, which is an advantage for watches with heavier titanium cases, such as the Coros Vertix and Apex Pro.
Accessories for Coros Heart Rate Monitors
The Coros ecosystem now extends beyond the wrist in the form of their dedicated optical heart rate monitor for the upper arm. As this is fastened around the bicep, a fabric strap is required that can withstand continuous muscle expansion without restricting blood flow. Once the original strap has lost its elasticity after countless sweaty sessions, it is important to replace it with a new strap made from a high-spandex/nylon blend to maintain the monitor’s high data quality and comfort.
Coros screen protectors, cases and spare chargers
Coros watches are acclaimed for their exceptional battery life, but when it’s time to recharge ahead of a multi-day adventure or an upcoming ultra-race, you don’t want to be left without power because of a lost cable. Investing in an extra charging cable to keep in your training bag, at the office or in the car is a cheap way to ensure you can always log your data.
Beyond power supply, the right accessories are all about maximising the watch’s lifespan in unforgiving environments. If you frequently navigate off-the-beaten-track trail terrain, go climbing or mountain biking where scratches and stone chips are a real risk, then a screen protector and a shock-absorbing case are a no-brainer investment. Although premium models feature highly scratch-resistant glass, an additional screen protector acts as a sacrificial anode, absorbing the direct impact of a sharp stone and thus protecting the original screen beneath. For the lightweight models in the Pace series, a thin, wraparound case provides valuable protection for the case during, for example, OCR races (obstacle course races) or rough training sessions, without weighing down your wrist.
Frequently asked questions about Coros straps
How do I know which strap width fits my Coros?
Coros watches use different standard strap widths depending on the size of the case. Generally speaking, the Pace series (Pace 2, 3 and Pro) and the Apex 42mm use 20 mm or 22 mm straps, whilst the more robust models, such as the Vertix 2/2S, require 26 mm wide straps. Find your specific watch model in our navigation, and we’ll show you only the straps that are guaranteed to fit your lugs.
Why do many Coros runners prefer nylon straps to silicone?
It’s primarily down to weight and adjustability. A nylon strap can reduce the watch’s total weight by up to half compared to a standard silicone strap. Furthermore, nylon straps don’t have pre-set holes, which means you can tighten it exactly as much as needed for the optical heart rate sensor to sit snugly against your skin, without it feeling uncomfortable.
Are the straps compatible with the “Coros Heart Rate Monitor” (bicep strap)?
No, straps designed for Coros watches (wrist straps) are not compatible with Coros’s optical heart rate monitor for the upper arm. The bicep strap requires a much longer, elasticated fabric strap specifically designed to be fastened around the arm. If you’re looking for replacement straps for your heart rate monitor, see our dedicated category for the “Coros HR Monitor”.
My nylon strap starts to smell after long training sessions – how do I wash it?
As nylon and fabric absorb sweat and salts, they need to be washed to prevent the fibres from breaking down. Remove the strap from the watch (using the quick-release fastener) and place it in a bowl of lukewarm water with a little mild detergent or soap. Gently squeeze out the water and rinse thoroughly. Allow it to air-dry completely – avoid tumble dryers or radiators, as intense heat can damage the Velcro and compromise the elasticity.