Sweat Absorbent For those who often wear bike helmets, motorcycle helmet, it is recommended to wear this hard hat liners. Motorcycle helmet liner can relieve moments of heat, itching and sweating. Lightweight In the evening or in windy, cold weather, the thin beanie is good enough to keep the head warm but not too hot. For people with bald or short hair, sometimes when walking or running, you may even forget that you are wearing this thin beanie. 4 Way Stretch The night cap is stretchable enough to stay on the head and keep hair flat. For family members who are undergoing treatment or chemotherapy, this sleeping cap can help reduce some cleaning work and help him become more confident. More suitable for people (21.2-23.2 inch head).