The Britax One4Life and Poplar S convertible car seats bundle keeps your child safe and comfortable in the car from birth through the booster seat years. The One4Life converts from a rear-facing infant seat to a forward-facing harness seat and finally a high-back booster, accommodating children 5-120 lbs and up to 63 inches. Its steel frame, SafeCell technology, and V-shaped tether provide trusted protection, while the knit fabric cover offers premium padding and cooling ventilation. Adjustments are easy with the 15-position headrest/harness and 9 recline positions. Complementing the One4Life, the slim 17” Poplar S rear-faces to 50 lbs then transitions to a forward-facing seat. Its patented ClickTight system ensures simple, secure installation every time by just opening the seat, threading the belt, and clicking closed. The Poplar S fits 3-across in most vehicles to allow flexible seating arrangements. It shares the One4Life's safety features like the steel frame and SafeCell technology, with a comfortable quick-adjust headrest and inserts. Both seats have machine-washable covers and dishwasher-safe cup holders for easy cleaning. With over a decade of use, premium safety features, a slim design, and machine-washable fabrics, the One4Life and Poplar S bundle simplifies safe family travel for children of all ages.