The swim cap is flexible enough to fit most size heads including women, men with short or long hair. It can accommodate and protect your hair from chlorine, salt water, keep your hair packed and tangle-free when swimming, have a clear vision! With 3D ergonomic ear structure design, the swim cap has extra room for the ears covering, it prevents overpressure, more comfortable, and adds an extra layer of protection for ears, limits the water flow entering your ears.