Under Armour Apparel Size Chart The Iso-Chill Short Sleeve is designed to disperse body heat, helping you keep cool in hot weather. It offers UPF 50+ rated UV protection, with quick-drying fabric and odor resistance. Features: - Fitted: Next-to-skin without the squeeze. - Built-in UPF 50+ sun protection-recommended by the Skin Cancer Foundation - Iso-Chill fabric helps disperse body heat, making it feel cool to the touch - Hybridized mesh paneling for ultimate breathability - Dropped hem with side vent - 100% Polyester - Only available to ship within the USA