The Britax One4Life Slim All-in-One Car Seat in gray and black features a SpaceSaver design, padded headrest, harness, armrests, and two cup holders for added comfort and safety.
The Britax One4Life Slim All-in-One Car Seat by Britax features two layers of energy management, built-in cooling channels, dishwasher-safe cup holders, 9-position recline, SafeCell technology, and ClickTight installation.
A collage shows the Britax One4Life Slim All-in-One Car Seat in four stages—from rear-facing baby to booster seat. The SpaceSaver design and ClickTight system by Britax provide comfort and safety as your child grows.
Three young children sit side by side in the back seat, highlighting how the Britax One4Life Slim All-in-One Car Seat’s 17.5-inch SpaceSaver design from Britax easily fits three across.
A woman smiles as she adjusts the headrest of the Britax One4Life Slim All-in-One Car Seat. Text above reads: 15-position, quick-adjust headrest & harness. SpaceSaver design by Britax ensures a comfy, secure fit as your child grows.
A woman installs a rear-facing Britax One4Life Slim All-in-One Car Seat in her vehicle. Text reads, Install with confidence—secure and simple setup with Britax ClickTight installation and SpaceSaver design.
A black steel frame reinforces the Britax One4Life Slim All-in-One Car Seat, helping to keep its structure sturdy and stable. Text: STEEL FRAME Reinforces the seat for added stability.
A woman puts a light gray Britax One4Life Slim All-in-One Car Seat cover in the washing machine next to her matching car seat. Text above reads: Machine washable & dryable, naturally flame-retardant fabrics, ClickTight installation.
A hand wipes crumbs from under a gray Britax One4Life Slim All-in-One Car Seat installed in a vehicle using a blue cloth. Text above says, Hassle-free cleanup. Easily manage messes with the convenient SpaceSaver design.
A baby sits safely in a Britax One4Life Slim All-in-One Car Seat, wearing a light outfit and looking up. The car seat includes safety straps, a cup holder, and SpaceSaver design as sunlight streams through the vehicle window.
A young child with curly hair smiles while safely secured in a Britax One4Life Slim All-in-One Car Seat inside a vehicle. The compact SpaceSaver design and cup holders are visible, with a grassy field outside the window.
A woman kneels beside a Britax One4Life Slim All-in-One Car Seat, helping a young girl in a striped shirt who’s buckled in, as she holds a white bottle inside their parked car with the door open.
A smiling young girl, wearing a white shirt, gray leggings, and tan shoes, is buckled into a Britax One4Life Slim All-in-One Car Seat with cup holders in the back seat. Trees and grass are visible outside the window.
The Britax One4Life Slim All-in-One Car Seat in gray offers a padded headrest, safety harness, two cup holders, and a SpaceSaver design for comfort and safety on the road.
The Britax One4Life Slim All-in-One Car Seat in gray features a SpaceSaver design, two layers of energy management, built-in cooling channels, dishwasher-safe cup holders, 9-position recline, and SafeCell technology.
Four photos show the Britax One4Life Slim All-in-One Car Seat with an infant, toddler, young child, and older child buckled in. Text: “Britax One4Life Slim—SpaceSaver design grows with your child for up to 10 years.”.
Three young children are seated side by side in Britax One4Life Slim All-in-One Car Seats. The SpaceSaver design from Britax ensures all three fit safely and comfortably across the back seat—perfect for families on the go.
A woman adjusts the Britax One4Life Slim All-in-One Car Seat’s 15-position, quick-adjust headrest and harness in a vehicle, ensuring a secure, comfortable fit for her growing child.
A woman installs the Britax One4Life Slim All-in-One Car Seat rear-facing in the back seat with ClickTight, securing it with a seat belt. Text below reads: Install with confidence. Secure installation without the struggle. ClickTight by Britax.
A black steel frame is shown in front of the Britax One4Life Slim All-in-One Car Seat, highlighting how Britax’s reinforced steel frame adds sturdiness and stability. Text above explains the benefit of the steel frame.
A woman stands by a washing machine, holding a gray Britax One4Life Slim All-in-One Car Seat cover. Text above reads, SAFE TO MACHINE WASH & DRY. The naturally flame-retardant gray car seat sits on top of the dryer.
A hand wipes crumbs from under a Britax One4Life Slim All-in-One Car Seat in light gray with cup holders. HASSLE-FREE CLEANUP: Tackle messes easily with the SpaceSaver design from Britax.
A baby sits securely in a Britax One4Life Slim All-in-One Car Seat with cup holder and SpaceSaver design, installed in the back seat. The car seat is gray, and the baby wears a cream-colored outfit while looking forward.
A young child with curly hair smiles while secured in a Britax One4Life Slim All-in-One Car Seat, featuring cup holders and the SpaceSaver design, as sunlight streams through the vehicle window.
A woman smiles while securing a young girl in a Britax One4Life Slim All-in-One Car Seat with ClickTight installation. The child, safe and comfortable, looks at her as she holds a drink cup inside the vehicle.
A young girl with curly hair smiles while sitting securely in a Britax One4Life Slim All-in-One Car Seat by Britax. She wears a white top, gray leggings, and tan shoes, safely buckled in the back seat of the car.
Britax One4Life Slim All-in-One Car Seat
The Britax One4Life Slim All-in-One Car Seat by Britax features two layers of energy management, built-in cooling channels, dishwasher-safe cup holders, 9-position recline, SafeCell Technology, ClickTight installation, and a SpaceSaver design.
Four images display the Britax One4Life Slim All-in-One Car Seat with SpaceSaver design, shown in different modes and ages. Text says, “Grows with your child for 10 years.” The Britax seat adapts to each stage.
Three young children sit side by side in Britax One4Life Slim All-in-One Car Seats, highlighting the SpaceSaver design that fits three across. Text below features Britax safety, comfort, and easy ClickTight installation.
A woman adjusts the headrest on a gray Britax One4Life Slim All-in-One Car Seat. Text above highlights its 15-position quick-adjust headrest and harness, plus SpaceSaver design for a comfortable, secure fit as your child grows.
A woman installs the Britax One4Life Slim All-in-One Car Seat in the back seat. Text reads: Install with confidence—Britax SpaceSaver design and ClickTight installation make setup easy and secure, without the struggle.
A black steel frame is displayed in front of the Britax One4Life Slim All-in-One Car Seat, demonstrating how Britax’s steel frame reinforces and stabilizes the seat structure. Text above reads: Steel Frame - Helps keep seat sturdy and secure.
A woman stands by a washing machine, taking off the fabric cover from a Britax One4Life Slim All-in-One Car Seat. Text: Safe to machine wash & dry. Naturally flame-retardant, ClickTight install, and SpaceSaver design by Britax.
A hand wipes crumbs from under a Britax One4Life Slim All-in-One Car Seat. Text reads, Hassle-Free Cleanup—easily manage daily messes with the convenient Britax SpaceSaver design and cup holders.
A young child with curly hair smiles in the Britax One4Life Slim All-in-One Car Seat, secured with a harness. The gray Britax seat features a SpaceSaver design, as the child wears a white shirt, light pants, and sneakers in the car.
A woman helps a young girl, seated in a Britax One4Life Slim All-in-One Car Seat, enjoy a bottle inside the vehicle. The girl smiles in her striped shirt, secure and comfortable with the Britax SpaceSaver design.
A young girl with curly hair smiles while safely buckled in a Britax One4Life Slim All-in-One Car Seat, enjoying the SpaceSaver design inside the car. She wears a white shirt, gray leggings, and tan shoes.
The Britax One4Life Slim All-in-One Car Seat in gray and black features a SpaceSaver design, padded headrest, harness, armrests, and two cup holders for added comfort and safety.
The Britax One4Life Slim All-in-One Car Seat by Britax features two layers of energy management, built-in cooling channels, dishwasher-safe cup holders, 9-position recline, SafeCell technology, and ClickTight installation.
A collage shows the Britax One4Life Slim All-in-One Car Seat in four stages—from rear-facing baby to booster seat. The SpaceSaver design and ClickTight system by Britax provide comfort and safety as your child grows.
Three young children sit side by side in the back seat, highlighting how the Britax One4Life Slim All-in-One Car Seat’s 17.5-inch SpaceSaver design from Britax easily fits three across.
A woman smiles as she adjusts the headrest of the Britax One4Life Slim All-in-One Car Seat. Text above reads: 15-position, quick-adjust headrest & harness. SpaceSaver design by Britax ensures a comfy, secure fit as your child grows.
A woman installs a rear-facing Britax One4Life Slim All-in-One Car Seat in her vehicle. Text reads, Install with confidence—secure and simple setup with Britax ClickTight installation and SpaceSaver design.
A black steel frame reinforces the Britax One4Life Slim All-in-One Car Seat, helping to keep its structure sturdy and stable. Text: STEEL FRAME Reinforces the seat for added stability.
A woman puts a light gray Britax One4Life Slim All-in-One Car Seat cover in the washing machine next to her matching car seat. Text above reads: Machine washable & dryable, naturally flame-retardant fabrics, ClickTight installation.
A hand wipes crumbs from under a gray Britax One4Life Slim All-in-One Car Seat installed in a vehicle using a blue cloth. Text above says, Hassle-free cleanup. Easily manage messes with the convenient SpaceSaver design.
A baby sits safely in a Britax One4Life Slim All-in-One Car Seat, wearing a light outfit and looking up. The car seat includes safety straps, a cup holder, and SpaceSaver design as sunlight streams through the vehicle window.
A young child with curly hair smiles while safely secured in a Britax One4Life Slim All-in-One Car Seat inside a vehicle. The compact SpaceSaver design and cup holders are visible, with a grassy field outside the window.
A woman kneels beside a Britax One4Life Slim All-in-One Car Seat, helping a young girl in a striped shirt who’s buckled in, as she holds a white bottle inside their parked car with the door open.
A smiling young girl, wearing a white shirt, gray leggings, and tan shoes, is buckled into a Britax One4Life Slim All-in-One Car Seat with cup holders in the back seat. Trees and grass are visible outside the window.
The Britax One4Life Slim All-in-One Car Seat in gray offers a padded headrest, safety harness, two cup holders, and a SpaceSaver design for comfort and safety on the road.
The Britax One4Life Slim All-in-One Car Seat in gray features a SpaceSaver design, two layers of energy management, built-in cooling channels, dishwasher-safe cup holders, 9-position recline, and SafeCell technology.
Four photos show the Britax One4Life Slim All-in-One Car Seat with an infant, toddler, young child, and older child buckled in. Text: “Britax One4Life Slim—SpaceSaver design grows with your child for up to 10 years.”.
Three young children are seated side by side in Britax One4Life Slim All-in-One Car Seats. The SpaceSaver design from Britax ensures all three fit safely and comfortably across the back seat—perfect for families on the go.
A woman adjusts the Britax One4Life Slim All-in-One Car Seat’s 15-position, quick-adjust headrest and harness in a vehicle, ensuring a secure, comfortable fit for her growing child.
A woman installs the Britax One4Life Slim All-in-One Car Seat rear-facing in the back seat with ClickTight, securing it with a seat belt. Text below reads: Install with confidence. Secure installation without the struggle. ClickTight by Britax.
A black steel frame is shown in front of the Britax One4Life Slim All-in-One Car Seat, highlighting how Britax’s reinforced steel frame adds sturdiness and stability. Text above explains the benefit of the steel frame.
A woman stands by a washing machine, holding a gray Britax One4Life Slim All-in-One Car Seat cover. Text above reads, SAFE TO MACHINE WASH & DRY. The naturally flame-retardant gray car seat sits on top of the dryer.
A hand wipes crumbs from under a Britax One4Life Slim All-in-One Car Seat in light gray with cup holders. HASSLE-FREE CLEANUP: Tackle messes easily with the SpaceSaver design from Britax.
A baby sits securely in a Britax One4Life Slim All-in-One Car Seat with cup holder and SpaceSaver design, installed in the back seat. The car seat is gray, and the baby wears a cream-colored outfit while looking forward.
A young child with curly hair smiles while secured in a Britax One4Life Slim All-in-One Car Seat, featuring cup holders and the SpaceSaver design, as sunlight streams through the vehicle window.
A woman smiles while securing a young girl in a Britax One4Life Slim All-in-One Car Seat with ClickTight installation. The child, safe and comfortable, looks at her as she holds a drink cup inside the vehicle.
A young girl with curly hair smiles while sitting securely in a Britax One4Life Slim All-in-One Car Seat by Britax. She wears a white top, gray leggings, and tan shoes, safely buckled in the back seat of the car.
The Britax One4Life Slim All-in-One Car Seat by Britax features two layers of energy management, built-in cooling channels, dishwasher-safe cup holders, 9-position recline, SafeCell Technology, ClickTight installation, and a SpaceSaver design.
Four images display the Britax One4Life Slim All-in-One Car Seat with SpaceSaver design, shown in different modes and ages. Text says, “Grows with your child for 10 years.” The Britax seat adapts to each stage.
Three young children sit side by side in Britax One4Life Slim All-in-One Car Seats, highlighting the SpaceSaver design that fits three across. Text below features Britax safety, comfort, and easy ClickTight installation.
A woman adjusts the headrest on a gray Britax One4Life Slim All-in-One Car Seat. Text above highlights its 15-position quick-adjust headrest and harness, plus SpaceSaver design for a comfortable, secure fit as your child grows.
A woman installs the Britax One4Life Slim All-in-One Car Seat in the back seat. Text reads: Install with confidence—Britax SpaceSaver design and ClickTight installation make setup easy and secure, without the struggle.
A black steel frame is displayed in front of the Britax One4Life Slim All-in-One Car Seat, demonstrating how Britax’s steel frame reinforces and stabilizes the seat structure. Text above reads: Steel Frame - Helps keep seat sturdy and secure.
A woman stands by a washing machine, taking off the fabric cover from a Britax One4Life Slim All-in-One Car Seat. Text: Safe to machine wash & dry. Naturally flame-retardant, ClickTight install, and SpaceSaver design by Britax.
A hand wipes crumbs from under a Britax One4Life Slim All-in-One Car Seat. Text reads, Hassle-Free Cleanup—easily manage daily messes with the convenient Britax SpaceSaver design and cup holders.
A young child with curly hair smiles in the Britax One4Life Slim All-in-One Car Seat, secured with a harness. The gray Britax seat features a SpaceSaver design, as the child wears a white shirt, light pants, and sneakers in the car.
A woman helps a young girl, seated in a Britax One4Life Slim All-in-One Car Seat, enjoy a bottle inside the vehicle. The girl smiles in her striped shirt, secure and comfortable with the Britax SpaceSaver design.
A young girl with curly hair smiles while safely buckled in a Britax One4Life Slim All-in-One Car Seat, enjoying the SpaceSaver design inside the car. She wears a white shirt, gray leggings, and tan shoes.
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Britax One4Life Slim All-in-One Car Seat

$749.00
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Description
Specifications
Top Features

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 it grows with your child for 10 years, starting with an extended rear-facing capacity of up to 22.7kgs, easily converting to a forward-facing toddler seat (up to 29.5kgs) and a high-back belt-positioning booster seat (up to 54.4kgs) when your child is ready.

With a slim outside and spacious inside, the 17.5” seat is designed to fit 3 across* without compromising safety and comfort. The SpaceSaver™ design paired with simple ClickTight® installation means you can install this car seat with ease and absolute confidence, every time.

Age Range

0 - 10 year(s) (as an approximation)

Height Range

45.5 cm - 160 cm

Weight Range

2.3 kg - 54.4 kg

Direction Facing

  • Rear & forward facing

Installation Method

  • LATCH or Vehicle Seatbelt

Travel System Compatible

  • No

Infant Insert Included

  • Yes

Safety Standards

Manufacturer's Warranty

One year, register with Britax

Product Weight

Product Dimensions

L: 52 cm
W: 49.5 cm
H: 63.5 cm

Seat Dimensions

D: 34.3 cm
W: 29.2 cm
H:

ClickTight installation system can be installed with confidence in 3 easy steps: pinch to open, thread and buckle, click it closed!​

SpaceSaver™ design: Slim outside, spacious inside! 17.5” seat designed without compromising on trusted Britax safety and premium comfort.

Hassle-free cleanup: Clean under the seat with ease – wipe it down with no fuss.

Grows with you: As a convertible and harness-2-booster seat in one, it grows with your child for 10 years.

15-position no-rethread harness:​ Adjusts quickly with one hand to help create the proper fit

Energy management: Protective seat shell and foam-lined headrest help absorb impact energy.

Patented v-shaped tether: Staged-release stitches help slow and reduce forward movement during a crash

High-performance car seat covers​: Soft knit fabric with woven mélange accents for a tailored look

Cooling channels: Improves air flow to keep your child comfortable

SafeCell® technology:​ Acts as a crumple zone, absorbing crash energy to help keep it away from your child

Naturally flame retardant with SafeWash: Car seat cover is safe to machine wash and dry and naturally flame retardant with no added FR chemicals.

Recycled polyester accents: Woven mĂŠlange accents on the exterior and comfort pads are made from recycled polyester

Dishwash-safe cup holders that slide out with ease for convenient cleaning

Rear-facing height & weight range: 45.5 - 124.5cm / 2.3 - 22.7kg

Forward-facing height & weight range: 89 - 124.5cm / 10 - 29.5kg

Booster seat height & weight range: 112 - 160cm / 18.1 - 54.4kg

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