The One4Life® Slim all-in-one car seat takes your child from birth to big kid with trusted Britax safety and a slim SpaceSaver™ design. As a convertible and harness-2-booster seat in one, it grows with your child for 10 years. It starts rear-facing with an extended capacity of up to 50 lbs, then converts to forward-facing toddler mode (up to 65 lbs) and high-back booster mode (up to 120 lbs). The 17.5-inch seat fits three across in many vehicles while providing premium comfort inside. ClickTight® installation makes setup simple in three steps. Features include a high-strength steel frame, SafeCell® crumple zone, V-shaped tether, and energy-absorbing shell. Cooling channels, premium fabrics, and dishwasher-safe cup holders add convenience and comfort. Dimensions: 24.5" H x 18.5" L x 17.5" D. Weight: 30 lbs.