i play. Boys Board Shorts with Built-in Reusable Swim Diaper | The original, patented triple-layer absorbent swim diaper |  Comfort seams, UPF 50+ protection, No other diaper necessary 100% Polyester Imported Machine Wash i play., Inc. is the original swim diaper manufacturer with over 20 years experience making, testing and improving our patented ultimate swim diaper The built-in 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 100% Polyester Machine Wash