"A waterproof cloth diaper cover that layers over our absorbent Inner to make a blowout-proof diaper. Can also be used on its own as a reusable swim diaper." This Esembly outer diaper is size 1 in the pattern Apostrophe in excellent used condition. It was washed with fragrance free detergent and never worn! Size 1: fits babies weighing approx 7-17 lbs Outers are made of 100% upcycled polyester TPU (derived from recycled plastic bottles). Our unique fabric is GRS and OEKO-TEX STANDARD 100 certified. Free of lead, BPA, PVC, and phthalates, our fabric is independently tested to meet both US and EU Standards for Food Safety (not that you eat out of your diaper covers, but you could if you wanted to!).