Under Armour Short Sleeve T-Shirt Raglan sleeve - construction allows for total mobility and a full range of motion, while eliminating shoulder seam abrasion points. Fabric - 95% 4.6 oz Polyester / 5% Elastane. Heatgear - fabric ideal for warmer weather. UPF 30+UPF - Ultraviolet protection protects your skin from the sun's harmful rays and inhibits premature ageing.