Patagonia Baby Long-Sleeved Capilene Silkwight T-Shirt will keep your little one comfortable when spending time in and out of the water. The breathable, stretchy Capilene® Silkweight fabric will dry quickly when wet and offers UPF 40+ sun protection when you are out and about. The smooth jersey fabric is comfortable against the skin and slides under layers easily. This full-coverage top has forward-shoulder seams, set-in sleeves and underarm gussets for movement and comfort which makes it a great next-to-skin base layer as well as an excellent stand-alone long-sleeve tee for your baby.