Whether your baby plays in a pool, takes a dip in the ocean, or just splashes around in your backyard, KaWaii Baby One Size Swim Diaper will contain the messes. Also perfect for swim lessons, swimming & water parks activities etc. Breathable lightweight waterproof outer material, mesh inner layer will let fluids through but retains solids. Adjustable Side and Rise snaps fit snugly. The pants are so stretchy and comfortable just like your underwear, it is not necessary to unbutton the snaps after using them. Note: Most public pools require young children not potty trained to wear a swim diaper for hygiene reasons. Our swim diaper can also be used as a training pants to hold small accidents. Babies can feel the wetness and they pull down their pants and go to the toilet. Lightweight, comfortable, easy to wash and fast drying. Adjustable to fit babies 10-40 pounds/3 Months & up. Note: Most public pools require young children not potty trained to wear a swim diaper for hygiene reasons.