The Kids' Patagonia Long-Sleeved Capilene Silkweight UPF T-Shirt is made from stretchy recycled polyester and spandex jersey with 40+ UPF sun protection for spending the day under the sun. A smooth jersey fabric is comfortable against the skin and slides easily under layers, with flat-seam construction throughout that prevents chafing with a full-coverage, long-sleeved top with forward-shoulder seams, set-in sleeves, and underarm gussets for movement and comfort. The drop-tail hem offers additional coverage, and longer cuffs provide room for growth spurts.