The Britax Poplar S convertible car seat and Britax Grow with You click-tight harness-2-booster car seat bundle offers a complete 2-in-1 car seat solution as your child grows from infant to toddler to big kid. The Britax Poplar S starts as a rear-facing infant car seat supporting up to 50 lbs. Its slim 17-inch design allows 3-across fit in most vehicles so you can accommodate multiple children. It features Britax's patented ClickTight installation system and 14-position harness for easy install and tailored fit. As your child grows, the Poplar S converts to a forward-facing toddler car seat. Layer on the Britax Grow with You seat for extended use as a 5-point harness forward-facing car seat supporting up to 65 lbs. This seat features ClickTight installation, 9-position harness, and later transitions to a belt-positioning booster up to 120 lbs. With Britax's trusted safety features like steel frame, SafeCell technology, and V-shaped tether, this bundle simplifies your child's transition through three car seat stages while providing renowned safety and comfort.