High density upgraded fabric provides better wear and UV rays resistance properties; unbeatable moisture-wicking fabric keeps your kids dry and cool in hot and humid days 【Thumb holes】BALEAF Girls' long sleeve shirts offer UPF 50+ protection and the thumbholes keep her sleeves in place and provide additional coverage to block UVA and UVB rays 【Non-chafing Raglan Sleeve】The raglan sleeve design to avoid chafing around your kids shoulder for added comfort, while the high stretch fabric provide enough space as your kids grow up 【Quick Sweat Drying】While your kids are hiking or playing around the beach, the breathable fabric absorbs sweat away from their skin and dries rapidly for more comfort 【Breathable, Lightweight】 The lightweight fabric is soft against the skin, and its collar is tag free for added comfort, suitable for worn alone or as a base layer