1. High bulkiness and good down plus innovative down filling structure design, bring you a light, fluffy, warm 0.15kg ultra-light down hat. 2. It is filled with duck down, and the amount of down filling is as high as 60g/plus polar fleece to lock the temperature. 3. The outer layer is made of waterproof fabric to prevent light rain. 4. The hat is spliced with reflective fabric, making it safer to ride at night.