Coolmax moisture management system and UV protection. Size Chest (to fit) S – 36/37″ M – 38/40″ L – 42/44″ XL – 46/48″ 2XL – 50/52″ Wash Instructions 40 degree machine wash, minimum agitation. Do not use biological detergents. Dry flat away from direct heat. Warm iron. Do not tumble dry. Do not dry clean.