The Chicco MyFit Zip Air harness/belt-positioning car seat is designed to grow with children from toddler through big kid with easy transition from five-point harness to vehicle seat belt. Nine headrest positions accommodate growth throughout both modes and work together with a four-position recline to support proper posture. An extra-deep ErgoBoost seat with dual-density foam padding is sloped and contoured for superior comfort. Reassuring Protection DuoGuard side-impact protection offers two layers of protection for two zones with a rigid shell and EPS energy-absorbing foam that surround the head and torso. The seat shell is also reinforced with a steel frame for superior impact protection. Easiest to Install The MyFit Zip Air is designed with smart functionality that makes it the easiest to install simply, accurately, and securely, every time. A four-position ReclineSure leveling system and RideRight bubble levels help achieve and verify proper angle in the vehicle seat. Premium LATCH connectors with a SuperCinch tightener and a LockSure belt-tightening system with wide routing make it easy to achieve a tight and secure fit with LATCH or the vehicle seat belt. User-Friendly Touchpoints A five-point, no-rethread harness provides reassuring security for growing toddlers and features a convenient, one-pull tightener and padded waist belt that helps keep the buckles accessible for easy in/out. The harness easily hides away to create a belt-positioning booster with shoulder and lap belt guides for big kids four years and up. Two dishwasher-safe CupFolders feature easy push-button removal and fold out of the way to save space when empty. And a bonus storage console fits into either CupFolder to carry big kid necessities. Added Comfort & Convenience The MyFit Zip Air includes bonus 3D AirMesh seat/backrest cushions to provide more padding and breathability where kids need it most. Also, their convenient zip-off design makes it easy to remove them for machine washing while still maintaining use of the standard fabrics underneath. Converts from 5-point harness to belt-positioning booster; 4-position, best-in-class recline provides a true range of adjustment; 3D AirMesh fabric improves ventilation throughout seat and backrest; Zip-off backrest/seat cushions for extra padding, extended durability, and easy cleaning; DuoGuard side-impact protection for head and torso + steel-reinforced frame; Deep ErgoBoost seat with dual-density padding and sloped, contoured design; 9-position headrest accommodates growth throughout both modes; RideRight bubble levels make it easy to verify angle in vehicle seat; Premium connectors and SuperCinch tightener for installation with LATCH; LockSure lock-offs and wide belt routing for installation with seat belt; 2 dishwasher-safe CupFolders and bonus Kid Console; Usage In harness mode, the MyFit Zip Air is designed for children who are at least 2 years old, between 25-65 pounds, and up to 54 inches tall. In booster mode, the MyFit Zip Air is designed for children who are at least 4 years old, between 40-100 pounds, and between 38-57 inches tall. Care & Maintenance Hand wash fabrics using mild soap and water, or machine wash in cold water on delicate cycle using mild detergent; hang to dry. For complete care and maintenance instructions, refer to the label on the product and to the product?s instruction manual. Specifications: Harness Mode - Forward-Facing: 25-65 lbs; Booster Mode - Harness + Booster: 40-100 lbs; Product Weight: 25 lbs; Product Total Width: 17.5"; Total Harness Slot Height: 20"; Total Belt-Positioning Clip Height: 21"; Product Interior Width (Shoulder): 12"; Product Interior Width (Hips): 11.5"; Product Interior Seat Depth: 15.5"; Product Max Seated Height: 29.5"; Assembled Product Max Seat Back Height: 27.5"; Product Depth (Footprint): 20"; Height Adjust Positions: 9; Crotch Positions: 2;.