Britax One4Life Slim ClickTight All-in-One Car Seat
- Regular price
- $589.00
- Sale price
- $589.00
- Regular price
-
$749.00
Or buy now from $147.25 per fortnight
- All-in-One Car Seat: One4Life® Slim is a convertible and harness-to-booster seat in one. It converts from a rear-facing infant and toddler seat (2.3–22.7kg) to a forward-facing harnessed seat (13.6–29.5kg) to a high-back booster seat (18–54kg)
- Up to 10 Years of Use: Grows with your child from 2.3kg to 54kg and up to 160cm tall
- ClickTight® Installation: Install with confidence in 3 easy steps: open, thread and buckle, then click it closed
Product details
The Britax One4Life® Slim ClickTight® All-in-One Car Seat is the one car seat that takes your child from birth to big kid. It starts as a rear-facing car seat from 2.3kg, converts to a forward-facing harnessed seat, then becomes a high-back booster for children up to 54kg, giving you up to 10 years of use from a single seat.
Your child can stay rear-facing up to 22.7kg (50lb), well beyond the minimum recommended in NZ. When they're ready, the seat converts to forward-facing with a 5-point harness up to 29.5kg (65lb), and finally to a belt-positioning booster up to 54kg (120lb) and 160cm tall.
Patented ClickTight® Installation makes a secure fit simple: open the seat, thread and buckle the seatbelt through the colour-coded belt path, then click it closed. At just 44.5cm wide, the slim SpaceSaver™ design is made to fit three across in many vehicles, without compromising on comfort or trusted Britax safety.*
The One4Life Slim features a high-strength steel frame, SafeCell® crumple zone technology and a patented V-shaped tether to help manage crash forces. Three removable infant inserts give newborns a snug fit, while cooling channels, premium padding and built-in armrests keep bigger kids comfortable on every trip.
*Britax cannot guarantee three-across installation in all vehicles. Always check compatibility and correct installation in your vehicle.
Key Features
- All-in-One, 3 Modes – Rear-facing (2.3–22.7kg), forward-facing harness (13.6–29.5kg) and high-back booster (18–54kg).
- Up to 10 Years of Use – One seat from birth to around 10 years, for children up to 160cm tall.
- ClickTight® Installation – Secure installation in three simple steps: open, thread and buckle, then click closed.
- SpaceSaver™ Design – Slim 44.5cm-wide seat, designed to fit three across in many vehicles.*
- Three Removable Infant Inserts – A better fit for babies up to 9.1kg (20lb).
- 15-Position Headrest & Harness – No-rethread harness and headrest adjust together with one hand as your child grows.
- 9-Position Recline – Quick-push recline with easy-read indicators for the right angle in your vehicle.
- High-Strength Steel Frame – Reinforces the seat structure to keep it sturdy and stable.
- SafeCell® Technology – Acts as a crumple zone, absorbing crash energy to help keep it away from your child.
- Patented V-Shaped Tether – Staged-release stitches help slow and reduce forward movement in a crash.
- Two Layers of Energy Management – The protective shell and foam-lined headrest help absorb impact.
- Anti-Rebound Bar Compatible – Add the Britax Anti-Rebound Bar for One4Life (sold separately) for extra stability when rear-facing.
- Colour-Coded Belt Paths – Make it easy to route the seatbelt correctly in each mode.
- Cooling Channels & Premium Padding – Built-in airflow and soft knit fabrics for comfort on longer drives.
- Slide-Out Cup Holders – Dishwasher safe, or remove them completely and fit the armrest caps to save extra space.
- SafeWash® Fabrics – Machine washable and dryer friendly, and naturally flame-retardant with no added FR chemicals.
- Hassle-Free Cleanup – Extra space between the shell and base, plus minimal grooves, make it easy to wipe down.
Why Parents Choose the One4Life Slim
- One seat for the whole journey: Rear-facing, forward-facing and booster in one, so you won't need to buy a separate booster later.
- Extended rear-facing: Supports rear-facing travel up to 22.7kg (50lb), so your child can stay rear-facing for longer.
- Easy everyday installation: ClickTight® technology makes a secure fit straightforward, even when moving the seat between cars.
- Space-saving design: At 44.5cm wide, the slim profile makes room for siblings, passengers or a third car seat.
- Ready from day one: Three infant inserts are included, so the seat is set up for your newborn straight out of the box.
- Easy maintenance: The SafeWash® cover can be machine washed and dried, and the shell wipes clean in seconds.
Britax One4Life Slim vs Poplar S
Both seats offer ClickTight® Installation, a slim design and rear-facing use up to 22.7kg. The big difference is how long they last: the One4Life Slim adds a high-back booster mode, so it keeps going long after a convertible seat is outgrown.
| Feature | One4Life Slim ClickTight® | Poplar S ClickTight® |
|---|---|---|
| Rear-facing | 2.3–22.7kg (5–50lb) | 2.3–22.7kg (5–50lb) |
| Forward-facing harness | Up to 29.5kg (65lb) | Up to 29.5kg (65lb) |
| High-back booster mode | Up to 54kg (120lb) | Not available |
| Years of use | Up to 10 years | Newborn to approximately 5 years |
| Seat width | 44.5cm | 43cm |
| Infant inserts | Included | Included |
| Anti-rebound bar | Compatible (sold separately) | Included |
Choose the One4Life Slim if you want one seat all the way to booster age, and add the Britax Anti-Rebound Bar for One4Life for extra stability when rear-facing. If you'd prefer the anti-rebound bar included and plan to buy a separate booster later, explore the Britax Poplar S ClickTight® Convertible Car Seat.
Not sure which to choose? Read our guide: Britax Poplar vs Poplar S vs One4Life Slim: Which to Choose (NZ).
Specifications
| Recommended age | Newborn to approximately 10 years, subject to height and weight limits |
|---|---|
| Rear-facing | 2.3–22.7kg (5–50lb), 45.7–124.5cm tall |
| Forward-facing harness | 13.6–29.5kg (30–65lb), 88.9–124.5cm tall |
| High-back booster | 18–54kg (40–120lb), 111.8–160cm tall |
| Seat width | 44.5cm |
| Harness & headrest positions | 15 |
| Recline positions | 9 |
| Infant inserts | 3 removable inserts, for babies up to 9.1kg (20lb) |
| Installation | ClickTight® seatbelt installation with V-shaped top tether |
| Colours | Raven Black, Mineral Grey |
| Included accessories | 3 infant inserts, 2 dishwasher-safe cup holders and armrest caps |
| Compatible accessories | Britax Anti-Rebound Bar for One4Life (sold separately) |
Why Buy the Britax One4Life Slim from Babies.co.nz
- Free installation: When you collect your One4Life Slim from our East Tāmaki store, our Certified Child Restraint Technicians will install it free of charge and show you how to adjust it as your child grows. Book your installation.
- See it in store: Visit our East Tāmaki showroom in Auckland to see the One4Life Slim and compare it with other Britax seats.
- Price Match Promise: Seen it cheaper at another NZ baby retailer? We'll match the price and give you 5% back in Rewards.
- Free shipping on orders over $200, plus Rewards on every eligible purchase.
Safety
SafeCell® TechnologyPatented V-Shaped Tether with Staged-Release StitchesHigh-Strength Steel FrameTwo Layers of Energy Management5-Point Safety Harness with Diamond Weave WebbingCompatible with the Britax Anti-Rebound Bar for One4Life (sold separately)
Comfort & Convenience
Delivery & Returns
We offer fast NZ-wide shipping, including free shipping on orders over $200 (exclusions apply), with most in-stock orders dispatched within 1–2 business days. If you change your mind, eligible unused items can be returned within 14 days for store credit, provided they’re in original packaging with proof of purchase.
Some items including clearance, hygiene, consumables, mattresses, gift cards and personalised products are non-returnable. Return shipping costs apply, and any damaged or faulty items should be reported as soon as possible so we can help.
View our full Shipping & Delivery and Returns Policy for more information.
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