HIIT, mountain climbers, squat jumps? No problem. On's Cloud X 4 is an ultra-flexible training shoe built for feel-good workouts. HIIT, mountain climbers, squat jumps? No problem. On's Cloud X 4 is an ultra-flexible training shoe built for feel-good workouts. On was born in the Swiss Alps with one goal: to revolutionize the sensation of running by empowering all to run on clouds. Thirteen years after market launch, On delivers industry-disrupting innovation in premium footwear, apparel, and accessories for high-performance running, outdoor, and all-day activities. Fueled by customer recommendation, On’s award-winning CloudTec® innovation, purposeful design, and groundbreaking strides in sportswear’s circular economy have attracted a fast-growing global fan base — inspiring humans to explore, discover and dream on.