Our one-size-fits-all diaper covers are soft, leak-proof, and durable. The double-gusset feature around the legs keeps the mess in, so your little one can run, jump, climb, and sleep while your mind is at ease. The durable snaps allow the covers to adjust to fit any baby (approximately 9-35 lbs.). Plus, they come in five adorable colors! To use, simply adjust the height snaps, snap in a Buttons diaper insert, and put the diaper on your baby. When its time for a diaper change, snap out the wet/soiled insert, and put it in your diaper pail. Covers can be used more than once before washing. Our daytime diaper inserts are made of 4 layers of absorbent micro fiber, with a luxuriously soft layer of fleece on top. Nighttime inserts have 6 wonderful layers of micro fiber, for extra absorbency. Buttons cloth inserts snap into our one-size diapers covers. Plus, they come in 2 sizes for your growing baby (small fits babies 9-20 lbs., large fits babies 20-35 lbs.)! It really couldn't be simpler. (Diaper inserts are sold separately.)