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 Aösta® 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.