One4Life (SafeWash) Stone Onyx
One4Life takes your child from birth to big kid with Britax Safety and ClickTight Installation.
It converts from a rear-facing infant seat to a forward-facing 5-point harness, to a high-back belt-positioning booster.
ClickTight is as easy as buckling a seat belt, so you can install with confidence, every time.
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.
10 Years of Use
One4Life convertible to booster car seat grows with your child from 5 – 120 lbs (2.3 - 54 kg) and up to 63” (160 cm) tall
With ClickTight Installation, you’ll know it’s right in 3 easy steps: Open, thread & buckle, click it closed.
Coverts from a rear-facing infant car seat to a forward-facing 5-point harness, to a high-back belt-positioning booster
High strength steel frame & crumple zone help absorb crash energy; patented v-shaped tether
Full Body Protection
2 layers of side impact protection surround the head, neck & torso
No Rethreading, Ever
15-position harness & headrest move together using one hand for the proper fit as your child grows
Safe to machine wash and dry; knit construction is naturally flame retardant
Relax & Recline
9-position, quick-adjust recline & easy-read level indicators help your find the correct angle for your vehicle & most comfortable fit for your child
Plush foam padding and fabrics for premium comfort & a quiet ride
SafeCell Technology acts as a crumple zone, absorbing crash energy to help keep it away from your child.
High strength steel frame reinforces the seat structure to help keep it sturdy and stabilized.
Patented v-shaped tether with staged-release stitches helps slow and reduce forward movement during a crash.
Energy-absorbing chest pads reduce your child’s forward movement during collision
2 layers of side impact protection: Energy-absorbing shell and foam-lining surround your child’s head, neck & torso.
5-Point Safety Harness with diamond weave webbing.
Removable Infant Insert helps keep your tiny baby safe and comfortable under 20 lbs (9.07 kg).
Installation & Fitment
Quick-Push, 9-Position Recline helps you find the most comfortable fit for your child and the best fit for your vehicle.
ClickTight Installation allows you to install with confidence, every time. You’ll know it’s right in just 3 easy steps: Pinch to open. Thread & buckle. Click it closed.
2-position buckle can be moved outward to accommodate your growing child.
2 recline positions help you find the most comfortable fit for your child and the best fit for your vehicle.
15-Position, Quick-Adjust Headrest & Harness create the proper fit as your child grows.
Color-coded belt guides make it easy to route the seat belt through the right paths for rear-facing, forward-facing, and booster mode.
Easy-Read Level Indicators help you find the correct recline angle for your vehicle.
SafeWash cover is safe to machine wash and dry; knit construction is naturally flame retardant.
Stay-put, soft comfort pads help prevent the harness from rubbing against your child’s delicate neck.
Removable Head Pillow provides additional comfort for your growing baby.
Tag-Free Headrest supports your child’s head and neck without irritation.
Easy-Pull Harness Adjuster lets you tighten the harness using just one hand.
Tether Storage keeps the tether straps organized and out of the way when not in use.
Flip-forward buckle Pad stays out of the way for easy boarding; made with extra padding for premium comfort.
Padding & Fabrics for superior comfort and a quiet ride.
Built-In Cooling Channels & Ventilated Mesh improve air flow to keep your child comfortable.
Dishwasher-Safe Cupholders easily twist out for cleaning between rides.
Proudly designed, tested and built in the USA with US and global components for safety and quality.
Child Fit Information
Rear-facing Harnessed Weight 5 - 50 lbs (2.3 - 22.7 kg)
Forward-facing Harnessed Weight 22 - 65 lbs (10 - 30 kg)
Belt Positioning Booster Weight 40 - 120 lbs (18 - 54 kg)
Rear-facing Harnessed Height Less than 49" (125 cm)
Forward-facing Harnessed Height Less than 49" (125 cm)
Belt Positioning Booster Height 44 - 63" (112 - 160 cm)
Exterior Product Dimensions
Product Weight 30 lbs (13.60 kg)
Product Dimensions (L x W x H) 20.5" (L) x 19.5" (W) x 25" (H) (52.07 cm X 49.53 cm X 63.5 cm)
Headrest Fully Extended Height 33.5" (85.09 cm)
Fully Reclined Depth 30” (76.2 cm)
Fully Reclined and Headrest Fully Extended Depth 35.5” (90.17 cm)
Interior Product Dimensions
Seating Area Depth 13.25" (33.65 cm)
Seating Area Width 11" (27.94 cm)
Shoulder Width 14" (35.56 cm)
Harness Slot Heights: 15 positions, 9"(22.86 cm) - 19"(48.26 cm)
Buckle Strap Positions: 5.5” (13.97 cm) / 6.75” (17.14 cm) / 8.75” (22.22 cm)
Britax strongly recommends that children should be secured with a harness system until they exceed the weight or height limits specified.