Esembly reusable cloth diapers are made up of two parts: an absorbent Inner (sold separately) and a waterproof Outer. Waterproof yet breathable, Esembly Outers are soft, stretchy and trim-fitting. Outers can also be used on their own (with no Inner underneath) as a swim diaper! Even better, they’re made of OEKO-TEX certified recycled fabric from 100% post-consumer plastic bottles. The Outer is the part of the diaper that provides the containment. If anything sneaks past the Inner, you can rest assured it won’t go beyond the Outer making the Esembly diaper blowout proof! The unique structure of the fabric allows for optimal heat and vapor transmission, keeping your baby comfortable longer. Outers come in two sizes and are designed to grow with your baby. Two rows of snaps at the waist allow you to adjust the size of the waist independently from the openings at the legs. This enables you to get a perfect fit on babies with big round bellies and skinny legs, and vice versa.