On Running Cloud X4 Black | Eclipse

Agile, responsive, and engineered for high-intensity cross-training. The fourth iteration of On’s versatile low-profile trainer refines lateral lockdown and propulsion, blending Helion™ superfoam with a newly tuned X-shaped Speedboard® to power seamlessly through road intervals, gym sessions, and dynamic lateral drills.

Sole thickness: Heel-to-toe drop: 7 mm (Heel stack approx. 28 mm / Forefoot stack approx. 21 mm)

Key Features:

• Weight: Approx. 268 g (Men's US 8.5)

• Multi-tonal upper cloaked in stealth "Black | Eclipse", pairing jet black engineered mesh with deep, shadowy slate undertones

• 100% recycled semi-translucent mesh upper offering zoned ventilation and reinforced abrasion resistance across high-stress flex points

• Redesigned X-shaped flexible nylon-blend Speedboard® built to enhance torsional stability during cutting movements while maximizing explosive forefoot snap

• Midsole powered by dual-density Helion™ superfoam combined with CloudTec® pods for soft landings and immediate energy rebound

• Raised lateral sidewalls and an internal midfoot skeleton locking the foot securely during rapid side-to-side transitions

• Plush, molded heel collar and cushioned tongue providing friction-free ankle lock and heel hold

• Low-abrasion rubber tread inserts strategically placed beneath the Cloud elements to maximize surface grip on gym turf, rubber floors, and asphalt

• Sleek, monochromatic aesthetic that coordinates naturally with technical performance wear, minimalist sportswear, and clean everyday streetwear

A consummate balance of Swiss engineering precision and versatile athletic utility, the On Running Cloud X4 in Black | Eclipse delivers lightweight agility, lateral stability, and all-day multi-surface durability — making it an essential training anchor for high-performance fitness rotations.