Amazfit Helio Strap Pro: Hands-On Review for Endurance Athletes

The Amazfit Helio Strap Pro is a dual-module chest strap that captures electrical heart rate data via ECG-based sensors, not the optical PPG technology you get on wrist-worn devices. That distinction matters enormously if you train with power, race with strict heart rate zones, or simply want accuracy that a wrist sensor cannot reliably deliver during high-cadence running or cycling. Amazfit is positioning this squarely against the Garmin HRM-Pro Plus and the Polar H10, and the hands-on time we got alongside an interview with the product director gave us enough to form a real opinion.

Sensors and Hardware

The Helio Strap Pro ships with two swappable modules. One handles real-time ECG-based heart rate and heart rate variability (HRV), transmitting over both ANT+ and Bluetooth simultaneously, which is exactly what you need if you run a Garmin head unit and also want data flowing to your phone. The second module adds running dynamics: vertical oscillation, ground contact time, stride length, and cadence. These are the same metrics you get from the Garmin HRM-Pro Plus, though Garmin has years of algorithm refinement on that side. Electrode contact quality on the Helio Strap Pro felt solid in brief testing, comparable to the Polar H10, which remains the benchmark for raw ECG accuracy at a chest level. The strap itself uses a textile electrode design with a snap-on pod, a format that washes well and avoids the corrosion issues that plagued older rigid straps.

HRV capture is a standout feature here. The strap records overnight or at-rest HRV sessions when paired with the Amazfit app, feeding into the brand's recovery scoring system. Whoop 5.0 still leads the wearables market on recovery analytics depth, but Whoop charges a subscription and sits on your wrist 24/7. The Helio Strap Pro gives you high-quality HRV data without the ongoing cost and without the optical limitations of a wrist PPG sensor. For athletes who already own an Amazfit watch, this becomes a compelling add-on rather than a standalone purchase. Check our coverage of the [Amazfit Q3 2026 software roadmap](/en/articles/amazfit-q3-2026-software-roadmap-19-devices-four-key-features-2026-06-18) to see which watch models will get full Helio Strap Pro integration by end of year.

Performance in the Field

In a short cycling session, the ECG heart rate data from the Helio Strap Pro tracked cleanly against a Garmin HRM-Pro Plus used simultaneously. No dropout, no lag spikes. That is the baseline expectation for any chest strap worth buying in 2026, and it cleared it. Running dynamics told a slightly different story. Vertical oscillation and ground contact time numbers were plausible and internally consistent, but comparing them session-to-session against Garmin's running dynamics showed occasional divergence of 5 to 8 percent on ground contact balance, which suggests Amazfit's algorithm is still maturing. Not a dealbreaker for most athletes, but competitive runners who use dynamics to tweak form should treat these numbers as directional rather than definitive for now.

Swimming is a gap. The Helio Strap Pro is not rated for open water or pool use. Polar H10 handles 30-meter water resistance and is the go-to strap for triathletes who want chest HR in the water. If you race triathlon and need a single strap that works swim-to-run, the Helio Strap Pro is not your answer today. For pure cyclists and runners, the waterproofing limitation is largely irrelevant, since most training stays dry. The battery life on the HR module is rated at 30 hours of continuous use, which comfortably covers ultra events and multi-day stage races without recharging mid-event. The dynamics module has a shorter quoted runtime of around 20 hours, still ahead of many competitors.

The Helio Strap Pro connects natively to the Amazfit ecosystem but also works as a generic ANT+ and Bluetooth sensor with Garmin, Wahoo, and Suunto devices. That open compatibility is a genuine strength. You do not need to be all-in on Amazfit hardware to benefit from this strap, which widens the potential buyer pool considerably. Amazfit has been aggressive about expanding its product lineup in 2026, with [10 or more launches confirmed](/en/articles/amazfit-helio-strap-2-what-we-know-for-h2-2026-2026-06-18) for the year, and the Helio Strap Pro fits into a broader strategy of building accessories that complement the watch lineup rather than just selling standalone devices.

What Is Missing

The lack of swim compatibility is the biggest omission, full stop. Polar H10 at a similar price point handles it without complaint. There is also no built-in GPS in either module, so the strap relies on a connected device for pace and distance data, which is standard practice but worth confirming if you planned to leave the watch at home. The Amazfit app's HRV analytics are functional but lack the contextual coaching depth that Whoop or even Polar's Nightly Recharge offers. You get the numbers, but the interpretation layer is thin. Firmware updates could address this, and Amazfit's [software roadmap for Q3 2026](/en/articles/amazfit-q3-2026-software-roadmap-19-devices-four-key-features-2026-06-18) hints at improved recovery insights, but it is not there yet. Running dynamics algorithm accuracy also needs another firmware cycle before it earns full trust for form analysis.

Verdict: the Amazfit Helio Strap Pro is a strong buy for runners and cyclists who want accurate ECG-based heart rate, solid HRV capture, and open-protocol compatibility without paying the Garmin HRM-Pro Plus premium. At its launch price it undercuts Garmin's flagship chest strap by a meaningful margin, and the dual-module design adds flexibility. Triathletes should stick with the Polar H10 until Amazfit adds swim-rated capability. Anyone deep in the Amazfit watch ecosystem, especially after the [Cheetah 2 Ultra](/en/articles/amazfit-cheetah-2-ultra-review-gps-heart-rate-battery-tested-2026-06-21), will find this strap a natural and well-priced complement.