This is a good quality skull cap made of 85% cotton and 15% spandex, which is soft, stretchy, lightweight, and quick-drying. It can effectively absorb sweat and wick it away, keeping your head dry and cool during various outdoor sports activities. It is suitable for cycling, running, hiking, skiing, motorcycling, fishing, and many other sports. The unisex design makes it suitable for both men and women to wear. One size fits most people with an adjustable strap at the back, which can be easily adjusted to fit different head sizes.