The Britax One4Life Slim All-In-One Car Seat is built for parents seeking a long-term, safe, and space-efficient solution for their child’s car travel needs—from infancy to big kid years. Designed with Britax’s renowned safety technologies like ClickTight installation, a SafeCell® crumple zone, high-strength steel frame, and V-shaped tether, this car seat delivers unmatched protection. It seamlessly transitions from rear-facing (up to 50 lbs) to forward-facing (up to 65 lbs) and ultimately to a belt-positioning booster (up to 120 lbs), supporting your child for up to 10 years. The 17.5” slim design makes it perfect for families who need to fit multiple seats across, while the spacious interior ensures all-day comfort. With premium flame-retardant-free fabrics made from recycled polyester, cooling channels, and hassle-free cleanup, it offers both luxury and convenience for busy parents.
Visually, the One4Life Slim features a tailored look with soft knit fabric and stylish mélange accents, offering a modern and sleek aesthetic. Built-in armrests and dual dishwasher-safe cup holders make rides more comfortable and practical. The seat is compatible with vehicle lap-shoulder belts and child restraint anchorage systems. Its convertible nature and compact frame make it ideal for tight backseat arrangements while ensuring no compromise on comfort or safety.
Britax is a globally trusted leader in child safety, known for its innovative, high-quality strollers, car seats, and travel systems designed to support families on every journey. With a legacy of over 50 years, Britax is committed to creating products that prioritize safety, comfort, and convenience. From advanced crash protection technology to thoughtfully designed features that simplify daily life, Britax helps parents travel confidently, knowing their little ones are secure and comfortable wherever they go. Explore Britax at ANB Baby for trusted gear that grows with your family.
Britax One4Life Slim All-In-One Car Seat Features:
3-in-1 Convertible Design: Transitions from rear-facing to forward-facing to booster mode for 10 years of use.
ClickTight Installation System: Install securely in 3 steps—pinch, thread, and click.
SpaceSaver™ Slim Design: 17.5" width fits 3-across in many vehicles without sacrificing child comfort.
High-Strength Steel Frame: Reinforces the seat for durability and structural integrity.
SafeCell® Technology: Acts as a crumple zone to absorb impact energy.
Energy-Absorbing Foam & Headrest: Minimizes crash forces and enhances comfort.
15-Position No-Rethread Harness: Adjusts easily with one hand to fit your growing child.
Cooling Channels: Enhances airflow for optimal temperature regulation.
Naturally Flame-Retardant Fabric: Soft, machine-washable fabric with no added FR chemicals.
Dual Cup Holders: Removable and dishwasher-safe for easy cleaning.
Stylish Design: Woven mélange accents made from recycled polyester, available in modern colors.
V-Shaped Tether: Staged-release stitches help reduce forward motion during crashes.
| Dimensions: | 18.5" L x 17.5" W x 24.5" H |
| Harness Slot Heights: | 9" - 19" |
| Buckle Strap Depths: | 5.5" - 8.75" |
| Seat Area Depth/Width: | 13.5" / 11.5" |
| Shoulder Width: | 14" |
| Rear-facing Harnessed Height: | 18" - 49" |
| Forward-facing Harnessed Height: | 35" - 49" |
| Belt Positioning Booster Height: | 44" - 63" |
| Rear-facing Harnessed Weight: | 5 - 50 lbs |
| Forward-facing Harnessed Weight: | 30 - 65 lbs |
| Belt Positioning Booster Weight: | 40 - 120 lbs |
| Recommended Use | |
| Weight Capacity: | 5 - 120 lbs |
| Cleaning Instructions: | Sponge clean shell and harness with warm water and mild soap, towel dry. Machine wash and dry cover if care label allows. Do not use abrasive cleaners, bleach, or iron any part. |
| Safety: | Always secure the seat using vehicle belts or LATCH system. Use anti-rebound bar rear-facing only. Remove infant inserts when child exceeds 20 lbs. Always ensure seat is fully locked and registered. Not certified for aircraft use in booster mode. |
| Brand: | Britax |
| Parchment Manufacturer SKU: | BRIE1D197G |
| UPC: | 652182749057 |
| Mineral Gray Manufacturer SKU: | BRIE1D197B |
| UPC: | 652182748326 |
| Raven Black Manufacturer SKU: | BRIE1D197A |
| UPC: | 652182748319 |
| Sea Foam Manufacturer SKU: | BRIE1D197F |
| UPC: | 652182749064 |
- 1- One4Life Slim All-In-One Car Seat
- 1- Infant Inserts
- 1- Anti-Rebound Bar
- 1- Dual Cup Holders
Can I use the One4Life Slim for a newborn?
Yes, it supports rear-facing from 5 lbs with included infant inserts.
Does this car seat fit three across in a vehicle?
Its 17.5" slim design is made to fit 3 across in many vehicle backseats.
How long can my child use this car seat?
It grows with your child for up to 10 years, from 5 lbs to 120 lbs.
Is the cover machine-washable?
Yes, the cover is machine-washable and safe to dry.
Can I use this seat on an airplane?
Yes, in harness mode only. Booster mode is not approved for aircraft.
Does it come with a cup holder?
Yes, it includes dual removable and dishwasher-safe cup holders.
Is it flame retardant-free?
Yes, the fabric is naturally flame-retardant with no added FR chemicals.
What type of harness system does it have?
It features a 15-position no-rethread harness that adjusts with one hand.
What safety technologies are built in?
It includes SafeCell® Technology, a steel frame, and V-shaped tether for crash protection.
Can I use this forward-facing with the anti-rebound bar?
No, the anti-rebound bar must be removed for forward-facing mode.
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