DRSKIN Cool Dry Short Sleeve Men Rash Guards UPF 50+ We recommend ordering ONE size up (Regular Fit) 92% Polyester, 8% Spandex - Smooth and Ultra-Soft Fabric that provides extreme comfort with very little weight without restriction Designed for all seasons(skiing, snowboarding, training, yoga, rashguard, all weather sports and activities) Non abrasion fabric material with excellent elasticity and durability, UV BLOCKING 98.8% Moisture Sensing/Quick time Dry/TWO-WAY Air Circulation, Cool in Summer and heat retention in winter Quick and Dry Transport System - Wicks Sweat away from the body, keeping you cooler and drier