Amazfit Helio Strap
Top PickWhat We Like
- Full training metrics in a free app
- Ten days between charges
- Micro-adjustable band that stays put
Worth Noting
- No built-in GPS; runs rely on your phone
- Woven nylon band holds water after swimming
- Weight
- 0.64 oz
- Battery Life
- 10 days
- Sports Modes
- 27
- Water Resistance
- 50 meters
The Helio Strap is the pick that makes the subscription question go away. Sleep with HRV, VO2 max, training load, recovery time and 27 sport modes — including rep and set counting for gym work and a dedicated HYROX race mode — all sit in the Zepp app with the useful data available without a subscription. Ten days of stated battery finishes the argument: this is a band you charge on a Sunday, not one that interrupts your week every few nights.
One design idea here we ended up liking more than we expected. The strap is built to be worn at the same time as an Amazfit smartwatch, and a HybridCharge score folds both devices' activity, sleep and stress into one readiness picture. If you already own one of their watches and want the screen off your wrist overnight, this is a tidy answer — the strap takes the night shift and the watch takes the day.
At 18.14 grams it is the heaviest band in this group, more than three times the Fitbit Air, and that heft is what buys the larger battery and the fuller sensor package. The hook-and-loop nylon closure is the easiest fastening here to fine-tune: you set it once and it stays where you put it, with none of the hole-punch compromise of a buckle.
Reliability is the caveat we cannot wave away. In some units the band stops charging or syncing within a few months, so register the one-year manufacturer warranty and keep the receipt somewhere you can find it. Auto-detected workouts are a convenience rather than a record; we start sessions from the band, which takes a second and keeps training load honest.
Bottom line: Our default pick: sleep, HRV, training load and 27 sport modes in a free app, with ten days between charges and no paywall in front of the data.