Under Armour Apparel Size Chart The Sunblock Short Sleeve provides excellent sun protection, with a UPF 50+ rating. It has a streamlined, fitted cut and quick-drying fabric that wicks away moisture and resists odor. A UA Coolswitch finish pulls heat away from your skin to keep you cool. Features: - Fitted: Next-to-skin without the squeeze. - Built-in UPF 50+ sun protection-recommended by the Skin Cancer Foundation - UA CoolSwitch uses an exclusive coating on the inside that pulls heat away from your skin, so you actually feel cooler - Material wicks sweat & dries really fast - Anti-odor technology prevents the growth of odor-causing microbes - Side stash pocket - 91% Nylon/9% Elastane - Only available to ship within the USA