# Maxi-Cosi Emerald S i-Size 360° Swivel, 40–150cm

Source: https://www.ranked10.co.uk/home/best-isofix-car-seats/maxi-cosi-emerald-s-i-size
Ranked #1 in "Best ISOFIX Car Seats 2026: 10 Ranked, and the Spec Fields That Fight the Copy": https://www.ranked10.co.uk/home/best-isofix-car-seats

- Price: £239.00 (checked on Amazon UK on 2026-09-16)
- Amazon rating: 4.6 from 666 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B0CWRZDY72?tag=ranked10-21

The Maxi-Cosi Emerald S i-Size sits at number one in our ISOFIX car seat guide. It is a £239 rotating seat sold for 40–150 cm, described as birth to 12 years and Group 0+123, with ISOFIX connectors, four recline positions and 14 headrest height positions. It carries a 4.6 out of 5 rating from 666 ratings.

The awkward part is in the seat's own spec table. The listing gives a rear-facing maximum weight of 36 kilograms — exactly the same figure it gives as the maximum weight recommendation for the seat as a whole. Nothing in the six bullets explains what that rear-facing figure refers to, and no bullet states any rear-facing height, weight or age limit of its own; the only limits spelled out anywhere are the 40–150 cm span and the 36 kg. The same table lists a 5-point harness next to Group 0+123, without saying at what point a child moves from the seat's own harness to the car's belt. The rating breakdown is another set of numbers that does not close: the five bars add up to 100 against the 666 ratings reported at the top of the page. Everything here comes from the Amazon listing as it appears, not from a seat we have fitted or tested.

## Specification

| Field | Value |
|---|---|
| Price | £239.00 |
| Customer rating | 4.6 out of 5, from 666 ratings |
| Rating breakdown | 1, 2, 7, 8 and 82 across the five bars — 100 in total (as listed) |
| Stated size range | 40–150 cm, 0–12 years, 0–36 kg |
| Installation type | ISOFIX |
| Orientation | Forward & rearward facing |
| Rear-facing maximum weight (as listed) | 36 kilograms |
| Maximum weight recommendation | 36 kilograms |

## Questions people ask

**What weight is the Maxi-Cosi Emerald S i-Size rated to?**

The listing gives 36 kilograms, and gives the same 36 kilograms as the rear-facing maximum weight.

**How is the Maxi-Cosi Emerald S i-Size fitted in the car?**

The installation type field says ISOFIX, and the i-Size bullet refers to ISOFIX connectors that lock the seat into the car with visual indicators of correct installation.

**Does the Maxi-Cosi Emerald S i-Size rotate?**

Yes. The listing describes FlexiSpin, a 360° rotational system that lets the seat rotate in any reclined position.

**How many recline and headrest positions does the Maxi-Cosi Emerald S i-Size have?**

Four recline positions and 14 headrest height positions, according to the listing.

**What size child does the Maxi-Cosi Emerald S i-Size cover?**

The listing states 40–150 cm, birth to 12 years, Group 0+123, up to 36 kilograms.

**Which safety standard does the Maxi-Cosi Emerald S i-Size meet?**

The listing says it is built to ECE R129/03, the i-Size standard.