The cap is made of cotton. It is designed for ponytail, simply pull hair through slot and adjust to desired style,perfect for pulling your messy bun or high ponytail through. Runners, golfers, tennis players, and any indoor or outdoor activities. Great for all seasons and provides shade while running quick errands, marathons, enjoying outdoor activities with our ponytail cap. Your logo is welcome. 23 1/4" Circumference.