One4life takes your child from birth to big kid with Britax safety and ClickTight installation. It easily converts from a rear facing infant car seat, to a forward facing 5-point harness, to a high back belt positioning booster seat. Safe wash cover is safe to machine wash and dry. ClickTight is as easy as buckling a seat belt, so you can install with confidence, every time. Color-coded belt paths show you where to route the seat belt for each installation mode. In addition, easy read indicators help you find the correct recline angle. A high strength steel frame, crumple zone, and v shaped tether help absorb crash energy. And, 2 layers of side impact protection surround your child’s head, neck and torso. As your baby grows, adjust the 15-position headrest & harness in seconds to create the perfect fit. When it’s time for booster mode, simply tuck the harness into the built in storage compartment. With cooling channels, premium padding and built in arm rests, your child will love the ride. interior product dimensions seating area depth 13.25" seating area width 11" shoulder width 14" harness slot heights 15 positions, 9" - 19" buckle strap positions. 5.5" / 6.75" / 8.75".