# Graco Affix i-Size Highback Booster

Source: https://www.ranked10.co.uk/home/best-toddler-car-seats/graco-affix-i-size-r129
Ranked #4 in "Best Toddler Car Seats 2026: 10 Ranked, and Where the Specs Disagree": https://www.ranked10.co.uk/home/best-toddler-car-seats

- Price: £59.99 (checked on Amazon UK on 2026-09-16)
- Amazon rating: 4.7 from 325 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B0CHW9ZGW7?tag=ranked10-21

The Graco Affix i-Size R129 sits at number 4 in this guide, and it is the £59.99 end of it: a forward-facing highback booster approved to the same R129 100–150cm standard as the £189.99 seat also listed here. Graco's own bullets describe a one-hand 10-position headrest, a 4.21 kg shell, colour-coded ISOFIX connectors and side ventilation, for roughly 3.5 to 12 years.

Two lines on the same listing disagree. The name and the first bullet lead on ISOFIX, while the spec table's Installation Type reads "Seat Belt" — and the second bullet backs the table up, calling the vehicle's seat belt "the main installation method" and the ISOFIX connectors "additional security". The spec table also files Age Range Description as "Toddler", in a seat whose own headline goes to about 12 years and whose Maximum Weight Recommendation is 41 kg. Everything on this page is taken from the Amazon listing; none of it comes from a test we ran.

## Specification

| Field | Value |
|---|---|
| Price | £59.99 |
| Customer rating | 4.7 out of 5 from 325 ratings |
| Stated size range | 100–150 cm (approx. 3.5 to 12 years) |
| Maximum Weight Recommendation | 41 kg |
| Installation Type (as listed) | Seat Belt |
| Age Range Description (as listed) | Toddler |
| Item Weight | 4.21 kg |
| Best Sellers Rank | 22nd in Car Seats, 1,456th in Baby Products |

## Questions people ask

**What size child does the Graco Affix i-Size R129 fit?**

Graco lists it as suitable from 100–150 cm, approximately 3.5 to 12 years, with a Maximum Weight Recommendation of 41 kg.

**Does the Graco Affix i-Size R129 need ISOFIX in the car?**

The Graco Affix i-Size R129 comes with colour-coded ISOFIX connectors, but Graco's own spec table gives the Installation Type as "Seat Belt", and the listing says the vehicle's seat belt is the main installation method while the ISOFIX connectors provide additional security.

**Is the Graco Affix i-Size R129 a toddler seat?**

The spec table's Age Range Description reads "Toddler", while the same listing gives the Graco Affix i-Size R129's size range as 100–150 cm, or about 3.5 to 12 years.

**How many headrest positions does the Graco Affix i-Size R129 have?**

The listing says it has a 10-position headrest that adjusts with one hand.

**How much does the Graco Affix i-Size R129 weigh?**

Graco lists the Affix i-Size R129 at 4.21 kg.

**What do the Graco Affix i-Size R129's dimensions cover?**

The listing gives Item Dimensions of 39.5 cm deep, 46.3 cm wide and 64.5 cm high.