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Affix™ i-Size R129

ISOFIX Highback Booster Car Seat


From 100 to 150cm (approx. 3.5 to 12 years)

New! Sale Best Seller

Affix™ i-Size R129

ISOFIX Highback Booster Car Seat


From 100 to 150cm (approx. 3.5 to 12 years)


In stock

Available exclusively at some one

coming soon

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€89.00 €89.00

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Free shipping on orders over €60

Delivery usually in 2-5 business days


2-Year Warranty

Lock, load and hit the road

Get a major boost of convenience, confidence and comfort with Affix i-Size R129. This highback booster has it all including built-in ISOFIX connectors that keep the car seat safely fixed in place — even when your growing child isn’t along for the ride. Plush premium padding and breathable fabrics are the cherry on top of this highback booster that truly does it all.

All The Features You Will Love

Graco Affix i-Size R129 IOSFIX highback booster girl sitting in Affix

Safety above all else

Our original Affix R44 highback booster has been adapted to meet i-Size and R129 standards. This means Affix i-Size R129 has undergone more extensive side impact testing and is compatible with any i-Size approved vehicle, reducing the risk of incorrect installation.

Graco Affix i-Size R129 ISOFIX highback booster mum installing ISOFIX in Affix

One click for additional safety

Affix i-Size R129 comes with colour-coded ISOFIX connectors for additional peace of mind. Although your vehicle’s seat belt is the main installation method for this highback booster, the ISOFIX connectors provide additional security and ensure the car seat stays in place even when it is not being used.

Graco Affix i-Size R129 ISOFIX highback booster gir sitting in Affix safety surround

Enhanced protection

This car seat is equipped with Safety Surround™ Side Impact Protection, which wraps around your child and provides enhanced head and body protection.

Graco Affix i-Size  R129 ISOFIX highback booster side ventilation

Stay cool and comfy

Keep your growing child comfy all year round thanks to the practical side ventilation that uses breathable fabrics to create a constant airflow.

Installation Video

Is Affix i-Size R129 Right for Me?


If you are looking for a highback booster with exceptional safety features, Affix i-Size R129 is here to help. This car seat comes with one-click ISOFIX connectors – a first for a Graco highback booster. While you still use the vehicle’s seat belt as the main installation method, the ISOFIX connectors provide extra protection to all other riders by ensuring the car seat stays in place and doesn’t become a projectile when not in use. 


Affix i-Size R129 meets the EU’s latest R129 safety standards and is i-Size certified, which means that it will correctly fit into any i-Size approved vehicle. For even more peace of mind, Safety Surround™ Side Impact Protection wraps around your child, giving them enhanced head and body protection. To ensure proper head and neck support at any stage, adjust the 10-position headrest with just one hand.


Suitable for kids between 100 and 150cm (approx. 3.5 to 12 years), this highback booster is packed with features that are focused on their comfort. Your growing child will stay cool no matter the season thanks to the car seat’s side ventilation design that uses breathable fabrics to create a nice and steady airflow. The premium padded seat with padded armrest covers means they will stay comfy for all your journeys together, and the 2 retractable cupholders come in handy when you’re on the go.


Weighing only 4.2kg, you can easily move Affix i-Size R129 between vehicles. In case of any spills or messes, simply remove the fabric covers and throw them in your washing machine for a quick cleaning.

All Features

- i-Size and R129 certified
- Colour-coded ISOFIX connectors for extra safety
- Safety Surround™ Side Impact Protection wraps around your child for enhanced protection

Ease of Use
- Lightweight at only 4.2kg, making it easy to move between vehicles for hassle-free journeys
- Machine-washable covers for easier cleanups

Child Comfort
- Side ventilation with breathable fabrics keeps your child cool
- 10-position headrest provides proper support for your child’s head and neck
- Premium padded seat delivers comfort on each and every ride
- Padded armrest covers for extra comfort on every journey
- 2 retractable cupholders keep drinks, gadgets and goodies right within reach
- Forward-facing highback booster mode from 100 to 150cm (approx. 3.5 to 12 years)

Product Length
Product Width
Product Height
Product Weight
Package Includes

(1) Affix i-Size R129 ISOFIX Highback Booster Car Seat

(1) instruction manual


What is the difference between Affix R44 and Affix i-Size R129?
There are currently 2 different car seat standards in the EU. R44 (legally known as ECE R44/04) car seats are divided into groups based on weight, with some covering multiple groups. Affix R44 is based on these standards.

Affix i-Size R129 meets the new R129 (legally known as ECE R129) standards. The main differences in these standards are that car seats are based on your child’s height and undergo more side impact testing. Affix i-Size R129 is based on these standards. You can learn more about car seat standards and help figure out which car seat is right for you in our car seat buying guide.

What is the purpose of the ISOFIX connectors on Affix i-Size R129?
The ISOFIX connectors act as an additional safety measure. Your vehicle belt will always be the main installation method for Affix i-Size R129, but the ISOFIX connectors ensure the car seat stays in place even if no one is riding in it. The handy colour-coded indicators confirm when the highback booster is connected correctly to your vehicle.

What is the maximum height and age for a child to ride in Affix i-Size R129?
This car seat can be used until your little one is your big one, up to 150cm or approximately 12 years of age.

How much does Affix i-Size R129 weigh?
Weighing only 4.2kg, Affix i-Size R129 is easy to move between various vehicles.

Can I machine wash Affix i-Size R129’s seat covers?
Yes, you can wash the covers in your washing machine with cold water only on the delicate cycle. Drip dry and do not use bleach.

Recommended Use

This car seat is suitable from 100-150cm (approx. 3.5 to 12 years)


Secure your child in the car seat using the vehicle's 3-point retractor safety belt.


Suitable for use with ISOFIX connectors as a secondary safety and stability measure. Always to be used in conjunction with the vehicle's 3-point safety belt for correct installation.

Care & Maintenance

To wash the covers: machine wash in cold water only on delicate cycle 30 degrees and drip dry. Do not use bleach.


Metal and plastic parts: clean with mild soap and cool water. No bleach or detergents.


From time to time, check your booster seat for worn parts, torn material and stitching. If damage is found, do not try to modify the booster seat. Contact Graco Customer Service for advice on replacement or repair.

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