The Kids' Patagonia Long-Sleeved Capilene Silkweight T-Shirt is crafted from a stretchy blend of 84% recycled polyester and 16% spandex jersey that provides 40+ UPF sun protection for active days outdoors. The crewneck design offers close-fitting coverage, while rolled-forward shoulder seams help prevent chafing under backpack straps. Underarm gusset panels allow for unrestricted movement and keep the shirt from riding up, and thumb holes at the cuffs ensure the sleeves stay in place during play or when layering. A slight drop-tail hem adds extra coverage, and a convenient locker loop at the interior neckline allows for easy hanging and drying.