The VX Carbon is back in stock - 4,000 km wear-tested, 42% energy return
184g · 8mm drop · 42% energy return
A marathon racer built around a full-length carbon plate suspended between two densities of supercritical nitrogen-infused foam. On the rig it returns 42% of input energy at a 3.2 m/s cadence - the highest figure we have ever measured, and 11 points above our own 2019 benchmark.
Dessa Kirui logged 2,840 km across five prototype generations before racing version five to a 2:21:04 in Chicago. The production shoe is her spec, including the 3mm narrower forefoot she asked for and the 8mm drop we have refused to change since version three.
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.
