Our cool long-sleeved screen-printed youth rashguards use a nylon/lycra stretch fabric that is tailor-made for watersports! Incredibly quick drying and tested at UPF 50+ (equals to SPF 150+!). Great for dry land activities too! (be sure to wash cold and hang dry). Rashguards are worn snug on the body (recommend jumping up a t-shirt size). The kids will look great and be protected too!