On Cloud X 4 - Women'sHIIT, mountain climbers, squat jumps? No problem. Here's an ultra flexible training shoe built for feel good workouts. X shaped Speedboard From burpees to box jumps, take on all moves in total comfort with the X shaped Speedboard. Made with a pliable nylon blend for better forefoot flexibility during multi lateral movements. More stable. More soft. The Helion superfoam midsole delivers cushioning underfoot, while extra padding in the heel means even