These Training Pants have built-in size. There are 3 rows of rising snaps in the front to adjust the crotch height and the waist is adjustable with 3 rows of snaps on either side. The outside is soft PUL waterproofing and the inside has Bamboo terry with 2 layers of Microfibre to absorb those little accidents that happen during Potty Training. Fits up to +-25kgs