i play. by green sprouts is the original reusable Swim Diaper manufacturer and has a patented three-layer design (U.S. Pat. No. 7,678,094). The wicking liner helps prevent diaper rash, the inner absorbent layer helps protect against messes outside the pool, and the waterproof outer layer works with the snug-fitting waist and legs to provide secure protection from unsanitary and embarrassing accidents in the pool. No other diaper necessary!