Nike Swim Boy's Heather Long Sleeve Hydroguard delivers full upper-body coverage from the sun with a UPF 40+ UV protective fabric. Internal neck tape helps to prevent chafing while he swims or plays and the soft Dri-Fit fabric wicks away moisture for quick-drying comfort. Dri-FIT TECHNOLOGY helps keep you dry and comfortable;UV PROTECTION from the sun on areas covered (UPF 40+);INTERNAL NECK TAPE offers added comfort against the skin;Heat transfer Swoosh;Standard Fit