More than just a running shoe, the K-Swiss Tubes Run 100 adds a whole new dimension to every footstep. A synthetic and mesh upper is combined with a stay-tied lacing system and k-EVA cushioning to enhance the motion of your foot. Large Tubes cylinders on the lateral side absorb strike shock while smaller support Tubes work with the medial side to stabilize the foot as it rolls inward. With extra rubber added to the heel to absorb stress and an Aosta II rubber sole, Tubes were designed with durability in mind. No matter where you go or how hard you step, Tubes will bounce right back and keep your feet protected.