Baby can move freely when learning to swim in the i play. pocket trunks with built-in reusable absorbent swims diaper made with lightweight material, in a pull-on style. With the built-in swim diaper, baby does not need any other diaper in the water. i play. Is the original swim diaper manufacturer and has a patented three-layer design. 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. The pocket trunks have a sizeable pocket for collecting treasures during outdoor play, and come in fun colors for an all-in-one diaper and swimsuit. With the durable, convenient, and machine washable fabric, baby can wear it over and over. Parents save money and appreciate the low impact on the environment from reusable swim diapers.