This swimming cap is mainly made of silica gel. It protects your head from water damage. It has great elasticity and can be stretched up to twice. It is suitable for any size of head and around the head without wrinkles. Try it on your favorite hiking, camping, swimming pool. Put your hair in your swimming cap and keep it dry while bathing or swimming. For adults, women and adolescents. It's easy to print your logo on it.8.7"x7.4"x7.5".