The Britax Poplar convertible car seat bundle includes two complementary 2-in-1 rear and forward-facing car seats featuring the trusted Britax ClickTight installation system and slim 17-inch SpaceSaver design to fit 3-across in most vehicles. The ClickTight technology provides easy seat belt access through clearly labeled, fully open paths and an automatic tensioner to ensure a secure install every time. Both car seats accommodate children rear-facing up to 50 lbs with 14-position harnesses and headrests to tailor the fit as they grow. The Poplar S seat includes premium inserts and padding for additional comfort and a stability bar to minimize movement if rear-ending when rear-facing. The slim but spacious seats feature Britax's patented safety technologies like SafeCell crumple zones and steel-reinforced frames to manage crash forces, plus naturally flame-retardant, machine washable fabrics. With their innovative installation and safety features, space-saving design, and long rear-facing capacity, these convertible seats provide a complete solution to simplify and enhance your child's transition through different stages.