Slim Fit: 18% spandex fabric with good elastic, order a Size Up if you don't like tighter fitting.CARE INSTRUCTION: Hand wash reverse side and use gentle detergent,do not scrub and iron printing pattern Durable stretchy Fabric quick dry long sleeved swim tops Upf 50+ Protection Shirts Stop Sun Burns Perfect for swimming, playing at the beach or going to the water park, the long sleeve t- shirt design provides extra sun protection for your little ones Not see through and no bleading; Return or exchange is free Estamico Rash Guard is professional for 2T-12T, was made with 82% Nylon, 18% Spandex,high quality and don't fade easily, soft and quick dry fabric makes baby feels very comfortable,UPF 50+ protection is the best choice for baby's outgoing