Britax One4Life ClickTight All-in-One Car Seat


Regular price $399.99


One4Life takes your child from birth to big kid with Britax Safety and ClickTight Installation. It easily converts from a rear-facing infant car seat, to a forward-facing 5-point harness seat, to a high-back belt-positioning booster seat. The Cool Flow mesh fabric improves air flow, keeping your child comfortable for the ride. ClickTight is as easy as buckling a seat belt, so you can install with confidence, every time. Color-coded belt paths show you where to route the seat belt for each installation mode. Plus, easy-read indicators help you find the correct recline angle. A high strength steel frame, crumple zone, and V-shaped tether help absorb crash energy. And, 2 layers of side impact protection surround your child’s head, neck and torso. As your baby grows, adjust the 15-position headrest & harness in seconds to create the perfect fit. When it’s time for booster mode, simply tuck the harness into the built-in storage compartment.

Recommendation – Britax strongly recommends:

  • Children ride rear-facing to the highest weight or height specified
  • Children should remain in a child seat with a 5-point harness until reaching the maximum weight or height allowed
  • The top tether be used at ALL times when installing the child restraint forward-facing.



ClickTight Installation

Install with confidence in three easy steps: open, thread & buckle, click it closed

2 Layers of Side Impact Protection

Energy-absorbing shell and foam-lined surround the head, neck & torso

Exclusive SafeCell Technology

Acts as a crumple zone, absorbing crash energy to help keep it away from your little one

15-Position, Quick-Adjust Headrest & Harness

Create the proper fit as your child grows

Patented V-Shaped Tether

Staged-release stitches help 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

Find the most comfortable fit for your child and the best fit for your vehicle

Cooling Channels

Improves air flow to keep your child comfortable

Easy-Read Level Indicators

Find the correct recline angle for your vehicle

Removable Cover

Easy to remove without taking off the harness

Dishwasher Safe Cup Holders

Twist out for easy cleaning between car rides


Available with High-Performance Fabrics


Vegan leather accents
Resists stains, moisture & odor
Safe to machine wash & dry



Naturally safe to machine wash & dry


Cool Flow

Ventilated mesh keeps baby cool



Resists stains, wicks away moisture, extra padding


Product Specs

Child Weight5-120 lbs

Product Dimensions20.5" x 19.5" x 25"

Seat Area Depth/Width13.25" / 11"

Shoulder Width14"

Harness Slot Heights9" - 19"

Buckle Strap Depths5.5" - 8.75"

Rear-facing Harnessed Weight5-50 lbs

Rear-facing Harnessed HeightLess than 49"

Forward-facing Harnessed Weight22-65 lbs

Forward-facing Harnessed HeightLess than 49"

Belt Positioning Booster Weight40-120 lbs

Belt Positioning Booster Height44" - 63"


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