Speedo Silicone Aqua V Swim Cap The ultimate hydrodynamic swim cap for elite performance Multi density design reduces drag by 5% by eliminating wrinkles and holding shape throughout your swim 100% silicone for extra comfort and ease to get on and off Zoned 3-D shape and smooth form make for an ergonomic fit around the base of the head and over the ears Different size options allow for the swimmer to get a more customized fit (sizes run a bit small, so size up when in doubt - large for most adults).Available in two sizes for optimum fit