i play. Baby Girls' Swim Diaper 2 Piece Tankini Set UPF 50+ 82% Nylon/18% Spandex Machine wash cold. Do not bleach. Dry flat. Do not iron or dry clean. i play., Inc. is the original swim diaper manufacturer with over 20 years experience making, testing and improving our patented ultimate swim diaper UPF 50+ fabric. Babies have sensitive skin and sensitive eyes, so special care must be taken to ensure they are properly protected from the sun while playing outdoors The i play. ultimate swim diaper provides layered protection. A waterproof layer, absorbent layer and a lightweight wicking layer Secure fit-trim and snug fitting around the legs and waist to contain solid matter No other diaper necessary 82% Nylon/18% lycra fabric