You need adequate protection against the elements even in warmer waters. This super comfy and quick drying thermal top protects you from windchill UV rays and rashes. Featuring a slim fit and fleece lining it also provides additional warmth and can even be worn under your wetsuit. Technical Features Slim fit Lightweight and soft Quick dry Materials Polyester (88%) Spandex fleece lining (12%) SIZE CHART: USe chest measurement for this garment