This product is a recreational sporting goods,Outside the 100% resistance to CHA, absorbent, breathable super-fibers, inside 100% breathable ultra-absorbent fiber.Shoes with high-strength carbon fiber shell shoes shell, frame, using the 7000 series high-quality aluminum alloy bracket, 195mm pitch (38 # and above), 85A wheels with high-quality high-elastic PU wheels, ABEC-7 bearings with high-quality color covers chrome steel bearings.