The Zoggs Ultra Fit Swimming Cap is made from 100% silicone that is extremely soft and is 30% stretcher that the average silicone cap. However these features are not what set it apart from any other cap as it has another feature that is so perfect for ever swimmer. The cap is deeper on the sides and has extra silicone that sits over your ear, covering them completely. Now most swimming caps generally come across your ear lobe and this is how most of the water get in underneath the cap to wet your hair and ears but having the extra depth on the ultra fit cap actually prevents water from entering. These are not 100% waterproof, however then do stop more water than the normal silicone cap so if you have issues with water getting in to your ear canal or simple do not want to get your hair wet, then this cap is for you. It is an adult size and comes in 3 colours.