Swim Hat is perfect for reducing heat loss from your head so you can stay comfortable in the water with no chin strap. The hat is held in place via a velcro strap at the back of the hat means you can adjust it for the perfect fit without any potential discomfort under the chin. Made of 2.5mm neoprene, and with a curved rim design to fully cover the ears, the Swim Hat is perfect for reducing heat loss from your head so you can stay comfortable in the water for longer. A velcro strap at the back of the hat means you can adjust it for the perfect fit. Material: 100% Neoprene