The Patagonia Boys Capilene Silkweight Long-Sleeved T-Shirt is built for all-day comfort and performance on trails or in the water. Patagonia designed this lightweight long sleeve tee with stretchy recycled polyester and spandex fabric that moves with kids while offering 40+ UPF sun protection. The crewneck design sits close to the neck for added coverage, and smooth shoulder seams prevent chafing under backpacks. Thumb holes in the cuffs and a drop-tail hem keep sleeves in place and provide extra coverage during active play