High Quality : Cycling skull cap with mesh fabric is durable, breathable, soft, fast to dry and moisture-wicking.Our wicking helmet liner soaks up your sweat and keeps it out of your eyes. Recommended for athletes. Protection Head : Comfortable to wear under hats, caps, helmets or alone to prevent your head from sunlight, wind or dirt. One Size Fits All : One size is suitable for women or men to wear.Even if you have an Einstein-sized noggin. Perfect for both men and women. Light : Skull cap is so lightweight and comfortable you'll forget you're wearing it. Like you, this skull cap helmet liner is ready for duty. Recommend : Thermal running beanie hat perfect for motorcycling, road racing or other outdoor activities.