A training favorite returns with an updated sole and supportive arc that helps keep your foot contained during side-to-side movement. A deep, comfortable footbed with soft foam gives you superior cushioning and energy return for HIIT classes that take you from floor exercises to the treadmill. Feature 1:Nike Renew cushioning gives you comfort with spring that makes for a smooth ride on the treadmill—and seamless transitions from one set to the next. Feature 2:Arc-shaped support on the updated sole acts as bracing to help keep your foot stable and contained during floor exercises.