Ready to go with room to grow! The Britax Poplar™ S Convertible Car Seat takes the stress out of moving to the next car seat stage thanks to the patented ClickTight® installation and slim SpaceSaver™ design. This car seat accommodates up to 50 lbs when installed rear-facing and switches to a forward-facing car seat as your child grows. ClickTight technology provides fully open seat belt paths, and the automatic tensioner takes care of the tightening. The baby car seat lets you adjust the 14-position no-rethread harness and headrest to create the perfect fit. Slim outside and spacious inside, the car seat features 17-inch SpaceSaver technology designed to fit 3-across* without compromising on Britax safety. The car seat has a patented SafeCell® crumple zone and V-shaped top tether to help manage crash energy. *Britax cannot guarantee 3-across installation fitment in all vehicles