Comfortable and Breathable and Washable The 4 Wheel inline skates with breathable mesh serface and removeable comfort liner. The soft inner lining breathable, comfortable, washable, removable that incredible comfortable for enjoyment. Durable Aluminum Frame Aluminum alloy integrated knife holder lighter, stronger and safer. The frame is engineered to provide a lower center of gravity and stability of speed power with the 80mm wheels. High Elastic Wear-resistant PU Wheels Inline speed skates with 80mm PU wheels, 85A hardness made by a urethane formula for an ultimate smooth easy ride. And the wheels are supported by ABEC-7 carbon steel bearings.