Previously known as the SealSkinz Winter Hat and one of the most popular waterproof hat s on the market this updated SealSkinz Waterproof Extreme Cold Weather Hat is totally waterproof durable and insulating complete with added foldable ear panels making it ideal for keeping your head warm and dry whether you are working outdoors or enjoying spending time in the great outdoors this winter This waterproof winter hat is unisex and has rear elasticated Velcro size adjuster for a personalised and more comfortable fit The front peak can be poppered out the way if not needed and the ear flaps add extra protection and insulation making this an incredibly versatile hat to keep your head dry and warm this winter Sizing Advice for SealSkinz Hats Simply measure the circumference of your head in centimetres just above your eyebrows and use the below as a guide Small - 55cm Medium - 57cm Large - 59cm X Large - 61cm