Britax One4Life Slim ClickTight All-In-One Car Seat
Britax One4Life Slim ClickTight All-In-One Car Seat
Qualifies for FREE SHIPPING
Arrives between 03/02/26 and 03/10/26
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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 50 lbs., so your child can ride rear-facing longer. When your child is ready, it easily converts to forward-facing toddler mode (up to 65 lbs) and high-back belt-positioning booster mode (up to 120 lbs). With a slim outside and spacious inside, the 17.5” seat is designed to fit 3 across* without compromising safety and comfort. ClickTight helps you install with confidence, every time.
*Britax cannot guarantee 3-across fitment in all vehicles
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Why Trust Baby Cubby?
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Best Price Guarantee
Best Price Guarantee
The product must be the exact same color/style/size and be in stock on competitor’s website. Unfortunately, we cannot price match auction-based websites and the seller must be an authorized distributor of the brand. Some brands and manufacturers are excluded from our price match policy.

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when items are purchased at full retail price and the
merchandise (of the same style, color, and size) is
discounted within 14 days of the original purchase date.
not eligible for price adjustments.
Price adjustments are not provided during Black Friday or
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Free Shipping!
Free Shipping!
Car seats over $95 ship free within the continental U.S.A. Unfortunately, orders shipping to Alaska, Hawaii, Puerto Rico, or APO/FPO addresses do not qualify for free shipping.
Easy Returns within 30 days
Easy Returns within 30 days
You can return your car seat within 30 days if it is unopened and unused. See our full return policy here.
Shop Confidently - Talk to our Gear Experts
Shop Confidently - Talk to our Gear Experts
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Features
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 to a forward-facing seat to a high-back booster seat
- 10 Years of Use: This slim all-in-one car seat grows with your child from 5 to 120 lbs and up to 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 17.5” seat is designed to fit 3 across without compromising on trusted Britax safety and premium comfort. *Note: 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
- 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
- Three Removable Infant Inserts: Help provide a better fit for infants 20 lbs. and under
- Accessible Color-Coded Belt Paths: Make it easy to route the seat belt through the correct path for each car seat mode
- Slide-Out Cup Holders: The dishwasher-safe cup holders slide out with ease for convenient cleaning and click back into place for a secure attachment during rides
- Cup-Holder-Free Option: Remove the cup holders completely and insert the armrest caps to save additional space
- 15-Position No-Rethread Harness and Headrest: Adjust together quickly and easily with one hand to help create the proper fit as your child grows; no rethreading, ever!
- Patented V-Shaped Tether with Staged-Release Stitches: Helps slow and reduce forward movement during a crash
- High-Strength Steel Frame: Reinforces the seat structure to help keep it sturdy and stabilized
- Quick-Push, 9-Position Recline with Easy-Read Indicators: Helps you find the most comfortable fit for your child and the correct angle for your vehicle
- SafeCell® Technology: Acts as a crumple zone, absorbing crash energy to help keep it away from your child
- Two Layers of Energy Management: The protective seat shell and foam-lined headrest help absorb impact energy and are designed to help keep your child's head, neck, and body safe
- Soft Comfort Pads: Help prevent the harness from rubbing against your child’s skin
- Flip-Forward Buckle Pad: Stays out of the way for easy boarding; made with extra padding for premium comfort
- Built-In Cooling Channels: Improve airflow to help keep your child comfortable
- Plush Padding: For superior comfort and a quiet ride
- Easy-Pull Harness Adjuster: Lets you tighten the harness using just one hand
- Harness Holder Slots: Keep the harness straps out of the way while your child gets in and out of the seat
- 5-Point Safety Harness with Diamond Weave Webbing: Provides adjustment points at the hips, shoulders, and between the legs
- Tag-Free Headrest: Supports your child’s head and neck without irritation
Rewards
Rewards
What's Included
What's Included
- Britax One4Life Slim ClickTight All-In-One Car Seat
- 2 Cup Holders
- 3 Infant Inserts
Specifications
Specifications
Height / Weight Capacity
- Height Capacity: Up to 63”
- Rear-Facing: 5-50 lbs
- Forward-Facing with Harness: 30-65 lbs
- High Back Booster Seat: 40-120 lbs
Product Weight / Dimensions
- Product Weight: 28 lbs
- Dimensions: 18.5" D x 17.5" W x 24.5" H
Additional Specifications
- Expiration: 10 years
- Harness Positions: 15
- Recline Positions: 9
Installation Options
- Tether LATCH
- ClickTight Seat Belt Installation
Compatibility + Accessories
Compatibility + Accessories
N/A
Additional Resources
Additional Resources



