2 Pack, backless belt-positioning boosters are designed for big kids raising them up to the proper height for the seat belt. Suitable from 40 - 120 lb (18 - 54 kg) or up to 63 in (160 cm) tall. The Solana 2 pack gives parents the flexibility to keep a spare in the trunk, with grandparents, or at a friend's, so they'll never be without a safe belt positioning booster seat.