The flat silicone cap is the most popular swimming cap amongst swimmers of all ages. It is easy to put on and off without pulling at the hair. The silicone swim hats are soft, smooth and stretchy. Although a man made material, the silicone is considered to be an eco-friendly product, due to its long lasting qualities. 
Silicone swim cap:
long life silicone
extremely elastic
exceptional comfort
high performance - high technology materials