High elasticity material on the front and back, four times the elastic coefficient, providing efficient wind-proof and warm function * Three-layer 3D Anti-Virus Design Cushion suitable for competition and long distance cycling * Updated 3D anti-backtiral pad , filled with high -stretch foam * durable, easy to care, allow multiple washing, don"t shrink, deformation, not mildew. * feel soft, comfortable, breathable, will not bring the discomfort of the skin.