Smart Bottoms' Too Smart Cover fits most babies 10-35 lbs. These covers feature double walled gussets, front and rear interior flaps to hold the insert in place and a wipe-able interior. The design and fit of the cover is similar to the 3.1, with 4 rise settings and 10 sets of snaps across the waist. We recommend a package of too smart inserts for each cover purchased. The cover does not need to be washed after each change, only when soiled or every 24 hours.