i play.. Baby Boys' Ultimate Swim Diaper 50% nylon/50% lycra Machine Wash Waterproof outer layer, super absorbent inner layer and wick-away lining next to baby's skin Snug-fitting around legs and waist Woven nylon, coated poly, cotton terry and poly wick-away lining No other diaper necessary I play. Swimwear is made from specially treated fabric with a uv protection factor of 50+