The Britax® One4Life® Slim all in one car seat takes your child from birth to big kid with trusted Britax safety, ClickTight® installation, and a slim SpaceSaver™ design. As a 3 in 1 car seat, it’s designed to grow with your child for up to 10 years. One4Life Slim starts as a rear facing car seat with an extended capacity of up to 50 lbs, so your child can ride rear facing longer. It easily converts to a forward facing car seat (up to 65 lbs) and a highback booster car seat (up to 120 lbs) when your child is ready. With a slim outside and spacious inside, the 17.5” seat is designed to fit 3 across* without compromising safety and comfort. ClickTight helps you install with confidence, every time. The base and shell are easy to wipe down for hassle-free cleanup. The car seat cover is safe to machine wash and dry, and it’s naturally flame-retardant with no added FR chemicals. This slim car seat features a high-strength steel frame, a SafeCell® crumple zone, and a V-shaped tether. As your child grows, you can easily adjust the 15-position no-rethread harness and headrest with one hand. With cooling channels, premium padding, three infant inserts, and built-in armrests, your child will love every ride. *Britax cannot guarantee 3-across fitment in all vehicles.