Found: a bulk-free swim diaper that *actually* works. Says customer Kelly: “I couldn't believe how absorbent it was without having the bulky padding I'm used to from other reusable swim diapers.” | 80% recycled nylon/20% spandex | Comfortable, snug fit with no-dig elastic waist and legs | Can be worn alone unless your pool requires a double layer Fabric: 80% recycled nylon/20% spandex, with UPF 50+ protection; lining is 100% water-resistant recycled polyester that contains waste without absorbing or swelling. Feel: Lightweight, smooth, and stretchy. Note: Swim diapers of any kind are designed to contain waste, not liquids.