The Diono car seat bundle pairs the Monterey 2XT convertible booster seat with the Ultra Mat back seat protector for complete coverage and protection. The Monterey 2XT grows with children from 40 to 120 pounds, converting from a highback booster to a backless booster through 11 headrest positions and a width expanding from 15 to 20 inches. Side impact protection, two cup holders, and a snack tray equip the seat for safety, comfort and convenience. The Ultra Mat protects back seats from indentations, scratches, scrapes, spills and dirt with a water-resistant 5-layer construction and high-density foam panels. Its anti-slip fabric grips seats firmly so car seats stay put. Three mesh pockets offer handy storage. Together, the car seat and back seat protector allow safe, mess-free transport of growing children while saving vehicle upholstery wear. Their crash-tested durability and adjustable fit provide years of reliable use.