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Britax Romer KIDFIX M i-SIZE Car Seat

  • From 100cm to 150cm (approx. 4 to 12 years)
  • Redesigned seating area
  • Design allows 3 seats in rear of car
NOW £139.00 INC VAT £132.38 EX VAT

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Product Details

Car Seat Features

  • Forward facing – 100 to 150cm
  • Easy to adjust, ergonomic headrest
  • Built in ventilation for better air circulation
  • Machine washable cover
  • 2-Year warranty when registered
  • Need help? Read our Car Seat Guide

About this Car Seat

The Britax Römer KIDFIX M i-SIZE is a highback booster with flexible installation options to suit any vehicle. Suitable for use from when your little one reaches 100cm (usually around 4 years old) until they no longer need a car seat when they reach at least 135cm or 12 years old. Made in Germany, with the whole product development under one roof alongside their state-of-the-art crash testing facility, you can be sure your little one is as safe as can be. Britax Römer have designed the KIDFIX M i-SIZE in partnership with leading car manufacturers and redesigned the seating area has been redesigned to help reduce the neck loads by up to 10%. Not only that, the seat is easy to adjust, as the headrest and upper belt guide are simple to raise or lower to fit your growing child.

The booster protects your child in 3 ways: the seat shell provides head to hip protection for your child, especially in the event of a side impact; the upper and lower belt guides provide correct positioning of the seat belt, and the padded headrest provides safety and comfort for your child’s head and neck and the seat's slim and compact design allows for three seats to be installed in the back row of a wide range of cars too for those who need it.

For further technical information or advice, please email your enquiry to our Child Seat experts - [email protected] or telephone the team direct on +44 (0)1978 667903


BrandBritax Romer
MPN2000035131, 2000035128, 2000035130, 2000035129, 2000039712, 2000039734

Customer Reviews
Delivery & Returns

UK Mainland Delivery Prices

Delivery Type Cost Estimated Delivery Time
Standard Delivery from £1.33 2-3 working days from day of despatch(Excludes weekends and Bank Holidays)
Express Delivery from £1.68 1-2 working days from day of despatch(Excludes weekends and Bank Holidays)
Special Delivery from £12.54 For any next working day delivery order before 4.30pm Monday to Thursday.
For any weekend delivery order before 4.30pm Friday
Click & Collect from £7.62 Collect your parcel from a local post office. 2-3 working days from day of despatch(Excludes weekends and Bank Holidays)

For international shipping please visit our delivery page.

For information about returning an item please visit our returns page.


Our Payment Options

Maestro Mastercard Visa PayPal V12 Retail Finance

Online we currently accept payment from the methods listed above including a wide range of finance options. In store we also accept payment in the form of cash and gift vouchers.

Finance Options

In order to get the kit you want, when you need it, without ruining the family finances we offer a highly flexible range of finance options to help you get the best products on your bike now rather than at the end of the season when you've saved up the cash to make the purchase. There are even interest free options which effectively spread the cost without costing you any extra.

D.T.(Automotives) Limited T/A Demon Tweeks is authorised and regulated by the Financial Conduct Authority and is the broker and not the lender. Our FCA registration number is 689896. D.T.(Automotives) Limited offers credit products from Secure Trust Bank PLC trading as V12 Retail Finance and Klarna. Credit is provided subject to affordability, age and status. Minimum spend applies. Not all products offered by Secure Trust Bank PLC are regulated by the Financial Conduct Authority.