Made with a waterproof polyester knit outer fabric to keep wetness inside, and a layer of buttery soft Oeko-Tex Standard 100 micro-fleece inside next to the baby's skin to wick moisture away and draw it into the absorbent removable insert.This is probably the trimmest fitting pocket diaper you will ever find. The crotch area has been cut narrow to reduce unnecessary bulk between the baby's legs, yet still leaves enough room to stuff with as much inserts as needed. The leg openings are highly adjustable to especially accommodate both slim and chubby thighed babies. Separate waist and thigh settings allow you to adjust each opening independently to ensure a snug fit.Inserts sold separately.MEDIUMWaist 11" - 20" Thighs 8" - 13" Rise 16" Weight Range 12-25 lb