Name: Britax One4Life Slim All-in-One Car Seat
Brand: Britax
Price: 439.99 USD
Availability: OutOfStock

Britax One4Life Slim All-in-One Car Seat

Select Color : Raven Black

Best price guarantee

Authorized retailer

Earn 10% back in rewards points

Free shipping on orders over $49

Notify Me When Available

Add to Babylist

[{"id":43110959939658,"title":"Raven Black","option1":"Raven Black","option2":null,"option3":null,"sku":"E1D267A","requires_shipping":true,"taxable":true,"featured_image":{"id":34787763093578,"product_id":8076366905418,"position":1,"created_at":"2025-11-27T03:57:19-05:00","updated_at":"2025-11-27T05:18:50-05:00","alt":null,"width":720,"height":720,"src":"\/\/strolleria.com\/cdn\/shop\/files\/E1D267A01_e13a19c6-2403-4772-aeea-cdc5fe3aa4d3.jpg?v=1764238730","variant_ids":[43110959939658]},"available":false,"name":"Britax One4Life Slim All-in-One Car Seat - Raven Black","public_title":"Raven Black","options":["Raven Black"],"price":43999,"weight":0,"compare_at_price":null,"inventory_quantity":0,"inventory_management":"shopify","inventory_policy":"deny","barcode":"652182749910","featured_media":{"alt":null,"id":26318680752202,"position":1,"preview_image":{"aspect_ratio":1.0,"height":720,"width":720,"src":"\/\/strolleria.com\/cdn\/shop\/files\/E1D267A01_e13a19c6-2403-4772-aeea-cdc5fe3aa4d3.jpg?v=1764238730"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}},{"id":43110959972426,"title":"Mineral Gray","option1":"Mineral Gray","option2":null,"option3":null,"sku":"E1D267B","requires_shipping":true,"taxable":true,"featured_image":{"id":34787763126346,"product_id":8076366905418,"position":2,"created_at":"2025-11-27T03:57:19-05:00","updated_at":"2025-11-27T05:18:59-05:00","alt":null,"width":720,"height":720,"src":"\/\/strolleria.com\/cdn\/shop\/files\/E1D267B01_a96f2ee2-5b4b-49b5-bc86-5df875bc31aa.jpg?v=1764238739","variant_ids":[43110959972426]},"available":false,"name":"Britax One4Life Slim All-in-One Car Seat - Mineral Gray","public_title":"Mineral Gray","options":["Mineral Gray"],"price":43999,"weight":0,"compare_at_price":null,"inventory_quantity":0,"inventory_management":"shopify","inventory_policy":"deny","barcode":"652182750671","featured_media":{"alt":null,"id":26318680784970,"position":2,"preview_image":{"aspect_ratio":1.0,"height":720,"width":720,"src":"\/\/strolleria.com\/cdn\/shop\/files\/E1D267B01_a96f2ee2-5b4b-49b5-bc86-5df875bc31aa.jpg?v=1764238739"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}},{"id":43110960005194,"title":"Parchment","option1":"Parchment","option2":null,"option3":null,"sku":"E1D267G","requires_shipping":true,"taxable":true,"featured_image":{"id":34787763159114,"product_id":8076366905418,"position":3,"created_at":"2025-11-27T03:57:19-05:00","updated_at":"2025-11-27T05:19:36-05:00","alt":null,"width":720,"height":720,"src":"\/\/strolleria.com\/cdn\/shop\/files\/E1D267G01_6a7c494a-91f8-4a61-a56d-28074dcd7fbd.jpg?v=1764238776","variant_ids":[43110960005194]},"available":false,"name":"Britax One4Life Slim All-in-One Car Seat - Parchment","public_title":"Parchment","options":["Parchment"],"price":43999,"weight":0,"compare_at_price":null,"inventory_quantity":0,"inventory_management":"shopify","inventory_policy":"deny","barcode":"652182750688","featured_media":{"alt":null,"id":26318680817738,"position":3,"preview_image":{"aspect_ratio":1.0,"height":720,"width":720,"src":"\/\/strolleria.com\/cdn\/shop\/files\/E1D267G01_6a7c494a-91f8-4a61-a56d-28074dcd7fbd.jpg?v=1764238776"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}]

VIEW MORE DETAILS

Add to Babylist

The Britax One4Life® Slim All-in-One Car Seat grows with your child from birth to big kid—offering 10 years of trusted safety in a space-saving 17.5" design that can fit 3-across*. With ClickTight® installation, a high-strength steel frame, SafeCell® crumple zone, and naturally flame-retardant fabrics, it delivers Britax’s highest standards of protection. Transition seamlessly from rear-facing (up to 50 lbs.) to forward-facing (65 lbs.) to high-back booster mode (120 lbs.). Cooling channels, premium padding, and an easily adjustable 15-position harness ensure comfort at every stage.

3-in-1 longevity: Rear-facing, forward-facing, and high-back booster in one seat (5–120 lbs)

Slim SpaceSaver™ design: 17.5" width fits 3-across* while keeping interior space comfortable

Extended rear-facing up to 50 lbs for added safety

ClickTight® installation ensures confident, secure installs every time

High-strength steel frame + SafeCell® crumple zone + V-shaped tether

15-position no-rethread harness and headrest adjust together with one hand

Cooling channels and premium padding for all-day comfort

Machine-washable, machine-dryable cover with no added flame-retardant chemicals

Three removable infant inserts for a better newborn fit

Built-in armrests for comfort as they grow

Easy-clean base and shell

*Britax cannot guarantee 3-across fit in all vehicles.

Child Fit

Child Weight Range: 5–120 lbs

Rear-Facing Harnessed:

Weight: 5–50 lbs

Height: 18"–49"

Forward-Facing Harnessed:

Weight: 30–65 lbs

Height: 35"–49"

Belt-Positioning Booster:

Weight: 40–120 lbs

Height: 44"–63"

Seat Dimensions

Product Dimensions: 18.5" L × 17.5" W × 24.5" H

Seat Area (Depth / Width): 13.5" / 11.5"

Shoulder Width: 14"

Harness Slot Heights: 9"–19"

Buckle Strap Depths: 5.5"–8.75"

Most orders are shipped via Fedex Home Delivery from our warehouse in New Jersey within 3 business day.

Transit times are typically 1 to 5 days. Please see our shipping page for estimated transit times to your location.

Please allow additional processing and shipping time during major holidays and sales.

Strolleria accepts returns of new, unused items that are returned within 30 days of receipt. See our return policy for more information.

Select furniture and special-order products are final sale and cannot be returned or exchanged. Please see policy for full details.

Britax One4Life Slim All-in-One Car Seat

Customer Reviews