The One 3 + offers the same features as the One 3, with an additional newborn insert.
The only Plus Test certified ISOFIX seat on the market allowing rear-facing travel up to 7 years of age (40-125cm/23kg). Secure installation in less than 30 seconds. Adjustable legroom after installation up to 30cm.
The One 3 platform has consistently been recognised for its top-tier safety, including approval from the prestigious ADAC safety test and the rigorous Plustest, the two toughest collision tests in the world.
One 3 is the only Plus Test approved rear-facing ISOFIX car seat certified for use from newborn up to 7 years old, accommodating children up to 125cm and 23kg. Built to last, it provides 15 years of dependable safety.
Weighing less than 10kg, One 3 is easy to handle and features adjustable sliding legroom from 0 to 30cm, making it perfect for everyday use.
Width
44 cm
Height:
76 cm
Depth:
54 cm
Adaptable front brace feature position
Yes
Seating depth
32 cm
Seating to buckle
18 cm
Support leg max.
52 cm
Support leg min.
26 cm
Adjustable support leg positions
x 14
Weight:
10 kg
Approved age:
0-7 years
Approved weight:
0-23 kg
Approved length:
61-125 cm
Attachment:
ISOFIX
Harness:
5-point internal
Seat ventilation:
Yes, holes
Removable cover
Yes
Machine washable cover:
30 degrees
With insert for children between 61 to 105 cm
ASIP is included
15 years of reliable safety
One 3 is the only Plus Test approved rear-facing ISOFIX car seat certified for use from newborn up to 7 years old, accommodating children up to 125cm and 23kg. Built to last, it provides 15 years of dependable safety.
Adaptable & user-friendly
Weighing less than 10kg, One 3 is easy to handle and features adjustable sliding legroom from 0 to 30cm, making it perfect for everyday use.
Hassle-free installation
Our straightforward 6-step installation process minimises the risk of errors, giving you peace of mind that your child is securely seated in just 30 seconds.
EasyClimb™
Magnetic harness holders make it simple to get your child in and out of the seat, while the sturdy frame allows older kids to climb in independently.
SleepWell™
With a one-hand recline feature, One 3 ensures a smooth and comfortable ride, helping your child relax and sleep soundly.
Shipping information
Most of our products are shipped within 12 hours of ordering, unless stated otherwise for backorders, or pre orders.
Free shipping throughout the UK, exc NI, minimum order spend is £100 for free shipping.
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From our customers
★★★★★
I’m so grateful I found the Car Seat Safety UK Facebook group where Gabi and Katie are trying to educate the UK on extended rear facing. After wasting money on 2 seats that only rear face up to 104cm/18kg, I needed something new for my high centile children.The first car seat I ordered didn’t work as well as I thought it would for me, so Gabi exchanged this no problem. Gabi provided a quick response on my request for her review of them installation. I’m so pleased with my Axkid Movekid, thank you! I admire what you’re doing amongst juggling your own family and young baby
Samantha
UK
★★★★★
Fantastic service, great communication and extremely helpful
Helen
UK
★★★★★
Super fast delivery and great after care. Answered all my questions promptly, I would highly recommend. Thank you!
Hadeel
UK
★★★★
Great service - both pre and post sale! Responsive and easy to deal with. Very fast shipping. Only regret is not discovering you sooner. Thank you !
Lucy
UK
★★★★★
Responded to my (rather silly) question basically immediately without making me feel ridiculous. Amazing value on the safest seats, and extremely quick delivery. Cannot fault the service from Simply Safe at all. Thank you x
AHL
UK
★★★★★
Ordered the avionaut stardust for my daughter after advice from Gabi, with just standard delivery it came before the expected delivery date. Easy to install, a great seat for my daughter aswell as very helpful advice before & after sale. Thank you so much!
Another great experience with simply safe! Unbelievably fast delivery and another great product, along with some very much appreciated free gifts. Thanks again!
