Elastic band - This hat is elastic and can be attached to the head to keep hair neat. It is thin, ultra-thin and lightweight and can be used as a nightcap or headwear for cancer prevention. Suitable for people (head circumference 54-59 cm). Lightweight - A thin hat keeps your head warm enough at night or in windy, cold weather, but not too warm. For bald or short-haired people, you can even forget you're wearing it when walking or running. Sweat-wicking - This soft helmet liner is recommended for those who often wear bicycle, motorcycle or other helmets. It immediately relieves heat, itching and sweat. Durability - This cap is versatile and can be used as a casual hat or a running cap. Two hats per pack, so you can share them with family and friends, or wear one hat while the others are being washed. It retains its color and shape after several washes. Comfortable - Everyone sweats from time to time. A cap can protect you from cold or sunburn. Breathable, suitable for spring, summer, autumn and winter.