Super one-size diaper covers adjust to fit babies from 12-40 lbs. These are basically a roomier version of our one-size diaper covers (PLUS they have PUL tabs inside at the front and back to keep the insert tucked in)! The Super diaper cover features: - Two layers of PUL throughout (wipe-able interior) - Double leg gussets - Waist elastic at back and tummy - Two rows of waist snaps - Interior PUL flaps to help keep diaper inserts tucked inside - Insert snaps to snap Buttons inserts in place - Compatible with all Buttons diaper inserts