On Cloudmonster 2 vs On Cloudmonster 3:
Which to Choose

On paper the two shoes are close cousins: both ride on a big CloudTec platform with a Helion foam midsole and a composite Speedboard (composite in the 2, TPU in the 3 — neither is carbon), both carry a high 5/6 cushioning rating, and their stack heights are effectively unchanged, sitting in the high-30s at the heel and low-30s at the forefoot. The measurable differences are small: the 3 is a touch heavier at 301g versus 292g for the 2 in a men's US 9, and its offset ticks up from 6mm to 7mm — a marginally more heel-biased slope. Where they genuinely diverge is ride character. The Cloudmonster 2 is the softer, livelier of the pair: its Helion stack feels plush and mildly bouncy, and the Speedboard adds a real sense of pop and forward roll once you pick up the effort. The Cloudmonster 3 goes the other way, trading that spring for composure — the foam feels notably firm and planted, transitions are smoother but more mechanical, and energy return drops off when you try to accelerate (its responsiveness rating falls from 4/6 to 3/6). In exchange, the 3 is the more stable, predictable platform, nudging from purely neutral to stable-neutral (stability 4/6 to 5/6), which makes it more accommodating for mildly pronating feet even without a medial post. Neither wants to run fast: both give up their best above roughly 5:00–5:15 min/km, and both are happiest on long, relaxed efforts.