Overview The Cloudboom Max is positioned as a super-trainer — enough Helion HF and rocker for race-pace work, without the carbon plate and without the Cloudboom Strike's price. Critically, the Speedboard is glass-fibre-reinforced nylon, not carbon, so it reads snappy rather than rigid. On positions it for runners aiming to finish a marathon well rather than chase a PB, and reviewers back that framing. The Cloudboom Max is a super-trainer, not a carbon racer, Speedboard is 8% glass-fibre-infused nylon, paired with a double layer of Helion HF (soft PEBA top, denser TPEE base). Details Best for: Marathon training for the first-time marathoner or back-of-pack racer Long runs with pace segments Runners who want Helion HF feel without a full carbon commitment The daily super-trainer next to a Cloudboom Strike on race day Specs: Category: Super-trainer / accessible racer Stack: 39.2 mm heel / 30 mm forefoot (lab-measured where available) Drop: 8 mm claimed / 9.2 mm measured Midsole foam: Dual Helion HF, soft PEBA top layer over a denser TPEE base Plate: Glass-fibre nylon Speedboard (8% glass fibre, NOT carbon) Outsole: High-abrasion rubber over CloudTec Phase race geometry Upper: Engineered race knit Colourway: White / Black, White / Juniper Sizing: 8 / 8.5 / 9 / 9.5 / 10 / 10.5 / 11 / 11.5 / 12 Materials & Care Designed in Zurich. Brush off dirt and debris after each run. Remove laces and insoles; hand wash uppers with cold water and mild detergent. Do not machine wash, tumble dry, bleach or dry clean. Air dry away from direct heat; CloudTec pods and Helion foam last longer when the shoe fully dries between uses. Rotate pairs where possible. Do not re-DWR yourself on road models. Bundle & Save Build a bundle and save up to 10% off. Shop Bundle Builder