Britax Romer KIDFIX SL Booster Seat



Fitted bundle deal

includes Accessories + Fitting

Britax Romer KIDFIX SL Booster Seat


Save £8.55
Was £90 *

Intervening prices may have been charged

Car Seat Info

20% off highback boosters

+ More Details
X Please select a Colour

How can I get it?

FREE Click & Collect

Car Seat Fitting
  • Description
  • Specification
  • Reviews
  • Delivery Options
  • Help & Advice
  • Price Match
  • Buying Options
  • Britax Romer KIDFIX SL Booster Seat

    Innovative features meet ease of use in this versatile car seat. Offering the highest levels of safety for children from 4 to 12 years of age (15-36kg), it can be installed in any car with ISOFIX or your car seat belt. The superior side impact protection comes in a slimline design, so there’s plenty of room for other back seat passengers. The seatbelt guides make the seat simple to fit, while the removable covers ensure that cleaning is easy. And as your little one gets bigger, they’ll always be comfortable – even when they’re asleep - thanks to a v-shaped backrest, and a height adjustable, ergonomically-designed headrest.  

    Safety features

    Ease of use features


    Car Seat Features

    •    Suitable from 4 years to 12 years (15-36kg).
    •    3 point seat belt fixing
    •    ISOFIX Compatible
    •    Forward facing
    •    Side Impact Protection
    •    Removable covers
    •    Adjustable ergonomic headrest

    Car Seats Baby Toddler Child
    Weight (kg) 0 - 19kg 9 - 36kg 15 - 36kg
    Weight (lbs) 0 - 42 20 - 80 33 - 80
    Height (cm) 40 - 105 70 - 135 100 - 135
    Height (Inch) 1' 4" - 3' 6" 2' 4"- 4' 5" 3' 4" - 4' 5"
    Age 0 months - 4 years 9 months - 12 years 4 - 12 years
  • Age: Child
    Age Band: 4 to 12 Years
    Group: Group 2-3
    Isofix Compatible: Yes
    Weight: 15 to 36kg
    Adjustable Headrest: Yes
    Depth of Seat: 38.0cm
    Direction: Forward
    Recline Positions: Forward 0, Rearward 0
    Removable Covers: Yes
    Restraint Method: Seat belt
    Rotating Seat: No
    Side Impact Protection: Standard
    Weight of Seat: 6.4kg
    Width of Seat: 51.0cm
  • Britax Romer KIDFIX SL Booster Seat is rated 4.7 out of 5 by 35.
    Rated 5 out of 5 by from Good value for your money This seat is perfect, it has the iOS fix so it doesn’t move about on the seat especially when little one isn’t in the car, he’s very comfortable in it and still able to sleep, in fact I think he sleeps better than he did in his previous seat, it’s not cheap but it’s also not expensive for what you are getting and that is safety and peace of mind that they are safe and comfy at the same time, I would definitely recommend this seat as a next step up, I think my son would also recommend it as he loves it, I just hope it’s still available in another year for my other little one when he’s old enough.
    Date published: 2018-05-10
    Rated 4 out of 5 by from Good all-round seat for nearly 4 year old Although I would've liked the option of a 5 point harness, just for the added support when my daughter falls asleep in the car, I thought this seat was a good purchase to make as she is getting older and seemed to have nice wide shoulder area plus an extendable headrest and good padding. Before this had a Maxi-Cosi Axxis seat so was a big change to a "big" seat but seems to be working out well.
    Date published: 2018-02-26
    Rated 5 out of 5 by from Good value Good quality easy to use and easy to fit, bright and easy to clean
    Date published: 2018-01-12
    Rated 5 out of 5 by from Excellent car seat - quick installation & lightweight This is an excellent car seat. Very quick and easy to fit (Mondeo 2015) using the isofix, and my daughter says it's very comfy. Time will tell how well it wears over the years but for now cannot fault it and the price (with the extra 20% off that Halfords were offering at the time of purchase) was excellent.
    Date published: 2017-10-24
    Rated 5 out of 5 by from Great seat Great seat for my grandaughter who is 4 years old. Its easy to fit. This is the second one I've bought, already have one for 5 year old grandson, they will last for years. Also easy to adjust back/head rest for different heights.
    Date published: 2017-10-19
    Rated 5 out of 5 by from Brita Romer SL Booster seat This is one of the best boosters on the market. My daughter is 5 yrs old and if I could she would still be strapped in a baby seat. The Britax Romer is the only booster I have seen that attaches to your isofix bars which makes me feel happier that she is secure in her seat. I would highly recommend this booster to any parents with a young child who needs a high back one.
    Date published: 2017-09-11
    Rated 5 out of 5 by from Great price Well made seat. Not as easy to fit as expected but that was probably due to my car having leather seats with a very tight fitting making it difficult to find the isofix points. The provide guides however helped me to fit the isofit clips.
    Date published: 2017-09-06
    Rated 5 out of 5 by from Good well designed chair It's a nice big seat for my Grandaughter who says it is much more comfortable than her old seat. I bought it to replace a non Isofix seat in my Honda Jazz. The only downside is that it is quite difficult to locate the clip when fastening the seat belt, due to the size of the seat, it is quite wide. On the whole a good but though.
    Date published: 2017-09-02
    • y_2018, m_9, d_19, h_14
    • bvseo_bulk, prod_bvrr, vn_bulk_2.0.8
    • cp_1, bvpage1
    • co_hasreviews, tv_0, tr_35
    • loc_, sid_205226, prod, sort_[SortEntry(order=FEATURED, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
    • clientName_halfords
  • UK Delivery

    £3.99 Standard Delivery available on orders under £40 placed by 8pm*

    Your delivery date will be communicated at checkout. Delivery times are Monday to Saturday.


    UK Delivery

    FREE Click & Collect - you can reserve an item online and pick it up from a store of your choice

    Simply enter your Postcode on the product page to check availability, and select Click & Collect at checkout. What's more, you pay for your items on collection. Click here to learn more.

    Items in stock - collect from 1 hour
    If your item is in stock at your chosen store, you can collect it from one hour after ordering online. We'll hold your item in-store for seven days.

    Items not in stock - collect next day*
    If your item isn't in stock, we can order it to your chosen store for collection.
    *If you place your order before 8pm you can collect it from 4pm the following day (except Sundays), and we'll hold your item in-store for seven days.

    Built Bikes
    Collection time will increase by 24 hours if you'd like us to build your bike for you.

    Please note that items sent directly from the supplier need to be ordered by 3pm for collection two days later. All delivery times will be shown during checkout.


  • Halfords - Our Price Match Promise

    At Halfords we strive to offer our customers first class service and products at competitive prices.

    In order to uphold our Price Promise to not be beaten on price, we actively monitor the prices offered by our competitors daily and adjust our own pricing accordingly.

    If you find a cheaper price we'll match it, and if you find it after you've purchased from us we'll refund the difference within 7 days of receipt of your goods.

    Simply take a print out of the competitor's online price into any Halfords store, ensuring, date and price are shown and we will match the competitor price if within policy.

    Terms & Conditions

    • The competitor's item must be identical (colour, size etc)
    • The competitor's item must be in stock at the time of match
    • The competitor's price must include delivery
    • The competitors price must be publically advertised online and cannot include any membership/personal discounts
    • We cannot match bulk promotional offers such as buy one get one free
    • The competitor must be based in the UK and sell direct to customers (no auction or marketplace retailers)
    • No other promotional offers or vouchers can be used on top of a price match
    • We will match within 7 days of receipt of purchase
    • We will match in store if our online price is lower than our store price
    • We will not match against clearance, closing down sales or specialist retailers such as market stalls.
    • In order to change the price of items bought on finance, the original agreement must be cancelled and a new one created at the lower price. The new agreement must still meet the minimum value and item requirements for finance.
    • Items sold by Halfords Approved Partners are not subject to our price match policy.
  • You can buy this product from one of our carefully selected Approved Partners. The full list of options available are below. Simply add your chosen option to your basket and proceed to checkout when you're ready.

    You can purchase products supplied by Halfords and selected other suppliers on

    Checkout is always via and all payment will be taken via In checkout the products will be split into separate deliveries for each supplier.

    Showing 1 - X of our buying options
    Price Seller Info Purchase




  • image of Maxi-Cosi Pearl Child Car Seat Summer Cover - Grey

    Sorry - this product is unavailable – Please check back soon

  • image of Britax Romer FIRST CLASS plus Summer Cover

    Sorry - this product is unavailable – Please check back soon

Some of the parts we sell here at Halfords have been reconditioned. These will carry a Refundable Deposit or an extra surcharge amount. When you add one of these reconditioned items to your basket, we'll add this extra cost automatically.

Once you've sent us your old item we'll check it over, and then refund you the full surcharge as long as everything is ok.

Before you return your old unit please make sure it's in re-serviceable condition. So if you're returning caliper casings, you'll need to double check they aren't badly damaged or broken. If the part you've sent is found to be unserviceable, we reserve the right not to refund the surcharge.

Please note that if you're returning your old unit to our National Returns Centre then this will be at your own expense.

Britax Child Car Seats

Britax Romer KIDFIX SL Booster Seat

£81.45 Britax Kidfix SL Sict Group 2/3 Highback Booster Seat