Thank you for viewing. I bought this for use in the school pool, and even wrote my name on it, but I ended up only using it once. Thank you. Swans Swimming Cap Adult size, Black, Free size 85% Polyester 15% Polyurethane This swim cap is made of a fabric similar to swimwear, which is highly breathable, prevents stuffiness, and is highly elastic. It feels good against the skin and is easy to wear.