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Britax KIDFIX I-SIZE PRO

£159.00

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From £35 · fee refundable

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30-day policy

About this seat

The Britax Kidfix I-SIZE Pro is a premium highback booster car seat, thoughtfully crafted to offer the perfect blend of safety, comfort, and flexibility for children aged 4.5 to 12 years (110 - 150 cm). Designed in Germany and approved by the latest i-Size (R129) regulations, it ensures your child is protected and comfortable on every journey.

Uncompromised Safety – Built for Your Peace of Mind

Safety is at the heart of the Kidfix I-SIZE PRO Designed with advanced impact protection, this highback booster supports the correct positioning of the seatbelt, reducing the risk of injury in both frontal and side collisions. The i-Size certification guarantees your child’s safety, allowing you to travel with peace of mind every time.

Comfort That Grows with Your Child

The Britax Kidfix I-SIZE PRO adapts as your child grows, thanks to its easily adjustable headrest and slim yet spacious design. The ergonomic padding ensures a comfortable experience on both short and long journeys. For warm days, the built-in air ventilation system keeps your child cool, while soft, breathable fabrics provide a cosy and secure environment.

Lightweight, Easy Installation for Maximum Flexibility

Weighing just 6.5 kg, the Kidfix I-SIZE PRO is designed for hassle-free portability. Switching between vehicles is a breeze, and with its integrated ISOFIX system, installation is quick, secure, and stable. Whether you’re doing the school run or a long family trip, this seat provides reliable comfort and protection.

A Seamless Fit for Every Car

Thanks to its slim 44 cm width, the Kidfix I-SIZE PRO fits seamlessly into most cars, even when fitting three seats in a row. Whether you have a compact or family-sized vehicle, this car seat ensures a perfect fit while still providing ample room for your growing child.

Key Features at a Glance:

  • Age Range: 4.5 years to 12 years (110 - 150 cm)
  • Safety Certification: i-Size (R129) approved
  • Lightweight Design: 6.5 kg for easy portability
  • ISOFIX Integration: Simple, secure installation
  • Adjustable Headrest: Easily adapts to your growing child
  • Air Ventilation System: Provides cool airflow for warm days
  • Slim Profile: Fits easily in most cars, even when fitting multiple seats

Why Choose the Britax Kidfix Pro M?

The Britax Kidfix I-SIZE PRO is more than just a car seat—it’s a long-term investment in your child’s safety and comfort. Whether it’s the school run or a cross-country journey, this highback booster ensures your child is always securely protected while enjoying the ride.

Ready to buy?

Britax KIDFIX I-SIZE PRO

£159.00

Not quite ready?

Smalls Install Plus

Professional fitting. Lifetime support.

Expert consultation, professional installation, and unlimited aftercare. From £35 at our Wincanton base — fee refunded when you buy your seat from us.

Initial Consultation

We discuss your child, car, and lifestyle to identify the best options.

Fit Check

We arrange a convenient time to test recommended seats in your actual car.

Professional Installation

Expert fitting and adjustment to the highest safety standards.

Lifetime Support

Unlimited advice for the full lifespan of your seat.

We travel up to 60 minutes at no extra charge.

Book Install Plus →

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