i play. Baby & Toddler Girls' Rashguard Set with Built-In Absorbent Swim Diaper 50% nylon/50% lycra Machine Wash Stretchy rashguard has short sleeves and shirred ties on sides Ultimate swim diaper has matching ties Nylon, lycra with polyester lining Built-in ultimate swim diaper: waterproof outer layer, super absorbent inner layer and wick-away lining next to baby's skin I play swimwear is made from specially treated fabric with a uv protection factor of 50+