The 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 convertible and harness-2-booster seat in one, it grows with your child for 10 years. It starts rear-facing with an extended capacity of up to 22.7 kg (50 lbs.), so your child can ride rear-facing longer. It easily converts to forward-facing toddler mode (up to 29.5 kg/65 lbs.) and high-back belt-positioning booster mode (up to 54.4 kg/120 lbs.) when your child is ready.

With a slim outside and spacious inside, the 44.5 cm (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.

One4Life Slim features an anti-rebound bar, 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.

Features

• All-in-One Car Seat: One4Life® Slim is a convertible and harness-2-booster seat in one! It easily converts from a rear-facing infant and toddler seat (2.3-22.7 kg/5-50 lbs.) to a forward-facing seat (10-29.5 kg/22-65 lbs.) to a high-back booster seat (18.1-54.4 kg/40-120 lbs.) 
• 10 Years of Use: This slim all-in-one car seat grows with your child from 2.3 to 54.4 kg (5 to 120 lbs.) and up to 160 cm (63”) tall
• ClickTight® Installation: Install with confidence in 3 easy steps: pinch to open, thread and buckle, click it closed!
• SpaceSaver™ Design: Slim outside, spacious inside! The 44.5 cm (17.5”) seat is designed to fit 3 across without compromising on trusted Britax safety and premium comfort. *Britax cannot guarantee 3-across installation fitment in all vehicles
• Premium Fabrics: The woven mélange accents give the car seat cover a tailored look, while the soft knit fabric on the padding and inserts helps keep your child comfortable during every ride
• Woven Accents on the Exterior and Comfort Pads: Made from recycled polyester
• Hassle-Free Cleanup: Extra space between the shell and base means you can clean under the seat with ease – and with minimal grooves in the seating area and base, you can wipe it down with no fuss
• Anti-Rebound Bar: Attaches to the car seat when installed rear-facing to help minimize movement in the event of a crash; must be removed when installed forward-facing
• SafeWash® Fabrics: No more hand-washing or waiting for the cover to air-dry; just quick and easy cleanup so you can keep moving
• Naturally Flame-Retardant Cover: With no added FR chemicals