Zoot Ali'i 16-U Running Shoe 100% Textile Imported Rubber sole Boa closure system for a secure and adjustable fit Molded 3d heel counter with integrated heel pull tab for fast transitions and great heel support Barefit lining combined with our internal structure to give the best internal feel and close to the foot fit Unique dual density z-bound and placed in a heel to toe configuration with great rebound for mid-foot strike and added cushioning when heel striking Breathable mesh upper allows for maximum drainage and optimal cooling