The VX Carbon is back in stock - 4,000 km wear-tested, 42% energy return
9-day battery · 5 kHz HR · 28g
A 28-gram wrist unit sampling optical heart rate at 5 kHz across four wavelengths, validated against ECG chest straps to a mean absolute error of 2.1 bpm during interval work - where most wrist optics fall apart.
Nine days of battery with continuous tracking, 50m water resistance, and a recovery score built from HRV, resting heart rate and sleep-stage data rather than a proprietary black box. Exports raw .FIT files; no subscription to read your own numbers.
Free 2-day shipping on orders over $75, dispatched from Boulder within 12 hours. Run in it for 90 days - if it does not hold up, send it back for a full refund.
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I rotate the Meridian through every easy day of a marathon block and measured the rebound myself at 640 km - still within 4% of new. The 10mm drop is forgiving at the end of a 35k when my form starts to fall apart.
Twelve weeks of heavy cleans and box jumps and the waistband has never rolled once. Compression still holds at the calf after about forty washes, which is more than I can say for the pair I replaced.
Wore the Stormline through the back half of a 100k in horizontal rain and stayed dry under it. Docking one star because the hood is cut tight over a cap - size up if you run in a visor.
I ran the Pulse against my chest strap for six weeks of track sessions. Average gap was around 2 bpm even on 400m repeats, and being able to pull raw FIT files without paying a subscription sealed it.
