On Cloud X 4 | Steel Blue Black Ice | 3WE30072545

Train Smarter. Run Sharper.

The On Cloud X 4 (3WE30072545) in Steel Blue/Black/Ice is the Cloud X 4 at its most focused — a colorway built for athletes who train with intention and want a shoe that looks as serious as their sessions. A cool steel-blue engineered knit mesh upper — constructed with recycled polyester — delivers a breathable, precision fit that moves with the foot through every training movement, while a black collar, black laces, and a tonal black On logo give the shoe a sharp, graphic edge. A subtle ice-blue heel accent provides the colorway’s only moment of contrast — restrained, precise, and exactly right. Beneath it all, On’s hidden Speedboard™ plate and black CloudTec® midsole pods deliver the same explosive, cushioned ride that has made the Cloud X the go-to cross-trainer for athletes who refuse to compromise.

Product Highlights

• 🎨 Colorway: Steel Blue Engineered Knit × Black Collar & Laces × Ice Blue Heel Accent × Black CloudTec® Midsole — focused, athletic, and precisely detailed
• 🧵 Recycled Engineered Knit Upper: Lightweight steel-blue engineered knit mesh upper constructed with recycled polyester fibers — breathable, flexible, and sustainably made, with a fine woven texture that provides structure and ventilation in equal measure. The knit construction wraps the foot in a precise, adaptive fit that moves naturally through every training movement
• ⚫ Black Collar & Lace System: Padded black collar lining and black lace system — delivering a secure, locked-down fit with a sharp tonal contrast against the steel-blue upper, giving the Cloud X 4 a clean, athletic graphic edge
• 🧣 Ice Blue Heel Accent: Subtle ice-blue heel panel — the colorway’s defining detail, providing a cool, restrained contrast that ties the steel-blue upper to the black midsole with a single, precise accent
• ⚡ Hidden Speedboard™ Plate: On’s exclusive concealed Speedboard™ plate embedded within the midsole — engineered to store and release energy with each stride, propelling you forward with a responsive, spring-like toe-off that transforms every step into forward momentum
• 💨 Black Open CloudTec® Cushioning: On’s signature open CloudTec® cushioning pods in the black midsole — individually compressing on impact to absorb shock across the full footstrike, then snapping closed at toe-off to work in concert with the Speedboard™ plate for maximum energy return. The Cloud X 4 features On’s latest pod geometry for improved cushioning distribution and a more natural footstrike
• 🔶 Black Rubber Outsole: Durable black rubber outsole with multi-directional traction pattern — providing reliable grip on gym floors, roads, and light outdoor surfaces
• 🏷️ Style Code: 3WE30072545

The Cloud X Story

The On Cloud X was designed for the athlete who refuses to choose between the gym and the street. Its hidden Speedboard™ plate delivers the energy return of a dedicated running shoe; its open CloudTec® midsole delivers the cushioning of a training shoe; its engineered knit upper delivers the comfort of a lifestyle sneaker. The Cloud X 4 is the most refined version of this formula yet — lighter, more responsive, and more versatile than any previous generation. The Steel Blue/Black/Ice colorway makes it the most focused version too.

Best For

Cross-training & gym workouts · Road running · HIIT & functional fitness · All-day lifestyle wear · Athletes who want performance and a sharp, athletic aesthetic

Sizing Guide

Available in US sizes 5 – 14 (including half sizes). Fits true to size. We recommend your standard On size. If you are between sizes, size up for a more comfortable fit. Contact us for sizing assistance.