This hydrodynamic swim cap is made with high-tech 3D moulding for a wrinkle free fit and minimal drag in the water. Plus it?s easy-to-wear for training or racing and is an easy fit for heads with long hair. Material Fit Silicone is a durable, highly elastic material that smoothes your head into a sleek shape while protecting your hair. Strong, soft and streamlined, you?ll feel at your best on game day in a silicone cap.