This velcro closure is perfect if a quick nappy change is needed. It is one size fits most (3kg – 16kg), the three-row snaps help you get a secure fit. The Velcro is also adjustable. The outer fabric is waterproof PUL. It has a dual gusset Inside the diaper against the babies’ bottom is a sued layer to keep the baby dry and comfortable. The sewn-in insert is 3 layer microfiber, and in the diaper is 2 layer bamboo.