The Best Bottom Heavy Wetter AIO Diaper will fit most babies from 10-40+ pounds and is available in your favorite Best Bottom Diaper prints and solids! The Heavy Wetter AIO’s inner is lined with two layers of super absorbent bamboo viscose. The included one-size insert boasts six layers of thirsty bamboo viscose that is topped with a soft no-pill fleece layer that keeps baby feeling dry. The Best Bottom Heavy Wetter AIO Diaper has double gussets, durable snaps, and leak stopper PUL strips on the front and back of the inside of the diaper – giving you the ultimate in wetness and mess protection! The soft, polyester-backed outer material is completely waterproof so no other diaper cover is needed.