On Cloudboom Zone vs New Balance FuelCell Rebel v5:
Which to Choose

These two agree on almost everything structurally: 6mm drop, neutral platform, no plate, a PEBA-based superfoam (On's Helion HF versus New Balance's PEBA+EVA FuelCell) doing all the propulsion, and a rockered geometry that rolls you forward and only truly comes alive around threshold effort. Both are genuinely light — the Cloudboom Zone is about 224g in a men's US 9, the Rebel v5 roughly 220g in a men's US 9.5 — so neither feels like a trainer holding you back. Where they split is cushioning and range. The Cloudboom Zone carries noticeably more foam (it rates higher on cushioning, a taller, more protective stack) and is tuned for a controlled, sustained push, which is why it stretches all the way to the marathon with the half as its sweet spot. The Rebel v5 is leaner and more agile, a touch lower underfoot, and it snaps fastest at 5K–10K and tempo work — its happiest distance is the 10K — while doubling as a legitimate daily trainer for quicker easy miles, a role the plusher, more race-leaning On fills less naturally. In short: same formula, but the On is the bigger, longer-range cruiser and the Rebel is the quicker, more versatile short-course shoe.