Ultra-endurance confronts athletes with major challenges, particularly maintaining energy and physical fitness across demanding and varied terrain. The On Cloudultra Pro model has been specifically designed to optimize these factors. Developed by the Swiss brand On through rigorous biomechanical analysis and intensive athlete testing, this product stands out as a cutting-edge technical solution. Its approach aimed at reducing muscle fatigue places it among the notable contenders for this year's Trail Running Awards.
Swiss engineering for energy efficiency
The Cloudultra Pro is the culmination of an ambitious development process: creating a shoe capable of maintaining energy efficiency and comfort over extreme durations. The design relied on Finite Element Analysis (FEA) and close collaboration with professional runners.
The model incorporates On's most advanced innovations:
Dual-density Helion™ HF midsole: It combines two densities of Helion™ foam for superior cushioning and energy return over very long distances. Laboratory and field tests have validated its impact on optimizing performance (VO₂ max) on both ascents and descents.
Lightweight construction: Weighing just 275g (men's EU size 44) and 220g (women's EU size 38.5), the shoe was designed to support performance without compromising durability.
Optimized stability and traction
Adapting to unpredictable mountain terrain was a priority, focusing on critical moments in the race: technical descents and steep climbs.
FEA-optimized Missiongrip™ outsole: Over 200 outsole configurations were analyzed using FEA software. The result is an optimized lug pattern and orientation designed to ensure superior grip on all surfaces and improve downhill control.
Leno Weave upper: This new weaving technique is used to offer exceptional breathability, a stable structure, and high abrasion resistance—qualities essential for the variable weather conditions of ultra-trails.
Validation and measured benefits
The scientific approach to developing the Cloudultra Pro has verified several concrete benefits for the athlete:
Fatigue reduction: Athlete testing has validated a reduction in muscle fatigue and better energy preservation.
Performance on technical terrain: The shoe demonstrated improved efficiency (VO₂ max) and enhanced impact stress management during both ascents and descents.
