This is a scarf worn on a half helmet, with the function of 1.360 ° sun protection and UPF>50 effectively blocking 98% of ultraviolet rays. 2. Dual physical cooling (1) The scarf has three air intake channels, which can guide the wind blowing from the front to the rider's back during cycling, quickly cooling the rider's back. (2) The scarf is made of ice silk fabric, with a cool touch.