Reebok Men's Reebok ZRX TR Training Shoe 100% Manmade Synthetic sole Mesh upper for breathability with DuraCage, FitFrame and NanoWeb technologies for added support Low-cut for mobility with a gas fueled Carbonated Foam midsole for a light, cushioned ride Inspired by sports car tires, the Z-rated midsole geometry is designed for improved handling and traction F48 flexible forefoot foam and stable S52 midfoot foam for dual density, functional comfort Midsole cradle for added stability and forefoot grooves for flexibility