BE COOL MARS I-SIZE CAR SEAT
7023SCMJAGR23
UN R129 i-Size highback booster for 100–150 cm (approx. 3–12y) with SPS side impact protection, multi-position headrest and 2 recline settings. Install with or without ISOFIX, always using the car belt.

i-Size 100–150 cm car seat with SPS and recline
i-Size UN R129 approved car seat for children from 100 to 150 cm (approx. 3 to 12 years). Designed to grow with your child thanks to its multi-position headrest, and to fit a wider range of vehicles with 2 recline positions. Includes SPS side protection to help absorb energy in side impacts and allows installation with or without ISOFIX, always using the vehicle’s 3-point seat belt.
Quick view
Key benefits you’ll notice every day
Multiple headrest heights help the seat adapt as your child grows. Ideal for families looking for a long-lasting solution for the 100–150 cm stage.
The 2 recline positions help the backrest sit better against different vehicle seats, especially useful if you switch cars or travel often.
SPS protection is designed to help absorb energy in a side impact. An extra layer of peace of mind for a high-back booster stage.
It can be anchored with ISOFIX to add stability and make daily use easier, although installation without ISOFIX is also allowed. In both cases, the child is secured with the vehicle’s 3-point belt.
Installation and use (quick and clear)
Forward-facing use. The restraint system is the vehicle’s 3-point seat belt. The seat can be used with ISOFIX (recommended if your car supports it) or without ISOFIX.
1) Place the seat on the vehicle seat
Position the seat and adjust it so it sits stable against the vehicle backrest.
2) Attach ISOFIX (optional)
If using ISOFIX, connect the connectors to the vehicle ISOFIX anchorage points to add stability.
3) Set the recline
Choose one of the 2 recline positions to match the vehicle seat angle.
4) Adjust the headrest and route the seat belt
Set the headrest to your child’s height and route the seat belt through the proper guides for correct belt positioning.
At algateckids we help you check compatibility and answer usage questions by WhatsApp, phone or e-mail. We are specialists in child car safety.
Technical tables
| Item | Specification |
|---|---|
| Approx. age | 3 – 12 years |
| Child height | 100 – 150 cm |
| Orientation | Forward-facing |
| Approval | i-Size UN R129 |
| Restraint system | Vehicle 3-point seat belt |
| ISOFIX | Optional (installation allowed with or without ISOFIX) |
| Side protection | SPS (energy absorption in a side impact) |
| Recline | 2 positions |
| Dimensions | 81–58 × 44 × 44 cm |
| Weight | 7.5 kg |
Warnings and safety information
Read all instructions carefully before installing, washing and using the product.
Quick comparison: with ISOFIX vs without ISOFIX
Both installations are allowed as stated. The main difference is the stability of the seat when the child is not sitting in it.
| Aspect | Installation with ISOFIX | Installation without ISOFIX |
|---|---|---|
| Child restraint | Vehicle 3-point belt | Vehicle 3-point belt |
| Seat stability | Higher | Correct (depends on positioning) |
| Daily use | More convenient | More dependent on re-positioning |
| Compatibility | Requires ISOFIX anchorage points in the vehicle | Compatible with more vehicles |
Why buy it at algateckids
In the 100–150 cm stage, a comfortable seat with a proper fit makes everyday life easier. Here you get a multi-position headrest, recline to better match the vehicle seat, and SPS side protection, with the flexibility of using ISOFIX or not.
At algateckids we’ve been helping families choose and install child car seats with real criteria for over 20 years. If you’re looking for an i-Size 100–150 cm seat, we’ll guide you so the belt is routed correctly and your child travels comfortably and safely.
Buy with confidence at algateckids
We help you choose, check compatibility and answer installation questions. Fast shipping (24/48 business hours) and friendly support.
Frequently asked questions
What child height is this i-Size seat for?
It is approved for children from 100 to 150 cm, with an approximate use range from 3 to 12 years depending on growth.
Is the child secured with a harness or the seat belt?
The restraint system is the vehicle’s 3-point seat belt. The seat acts as a high-back booster and guides the belt.
Is ISOFIX mandatory?
No. It can be anchored with ISOFIX if the vehicle supports it, but installation without ISOFIX is also allowed.
What is SPS protection?
It is a protection system designed to help absorb energy in a side impact.
How many recline positions does it have?
It has 2 recline positions to improve fit against the vehicle seat.
Supplier details
Name: JANE, S.A.
Address: C/ Mercaders 34, 08184, Palau Solità i Plegamans, Barcelona, Spain
Email: info@groupjane.com