Advertising Disclosure I Size Car Seat Comparison - April 2026
7 Best I Size Car Seat In the UK
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant's customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. As an Amazon Associate we may earn from qualifying purchases. We may receive a commission from purchases made through links on our site, which will help us continue to provide you with value.
Advertising Disclosure
| 1 Best Choice  9.9Exceptional | 2  9.7Exceptional | 3 Best Value  9.5Excellent | 4  9.3Excellent | 5  9.2Excellent | 6  9.1Excellent | 7  9.0Excellent |
| View DealOn Amazon | View DealOn Amazon | View DealOn Amazon | View DealOn Amazon | View DealOn Amazon | View DealOn Amazon | View DealOn Amazon |
ModelMaxi-Cosi Tanza i-Size, High Back Booster Seat, 3.5–12 years, 100–150cm, Compact Foldable Car Seat, 10 Headrest Positions, G-CELL Side Impact Protection, Padded & Elevated Kids Car Seat, Full Black | Model Kinderkraft Comfort UP Car Seat, I-Size Booster Child Seat, with 5 Point Harness, Adjustable Headrest, for Toddlers, Infant, Group 1/2/3, 9-36 Kg, Up to 12 Years, Green | Model Feakaou 360 Car Seat with ISOFIX - for Newborn to 12 Years Children, i-Size (ECE R129/E4) Rotating Swivel Baby Car Seat,Group 0+1/2/3 (40-150cm),Rear Facing for Longer from Birth to 4 Years.Black. | Model Silver Cross Essentials - Balance i-Size Car Seat - Toddler Car Seat - Isofix Car Sear - 5 Point Safety Harness - 15 Months to 12 Years - Black | Model Graco Junior Maxi i-Size R129 Highback Booster car seat with cupholders, Suitable from 100-150cm (approx. 3.5 to 12 years), Midnight fashion | Model Graco Affix i-Size R129 with ISOFIX Highback Booster car seat with cupholders, Suitable from 100-150cm (approx. 3.5 to 12 years), Midnight fashion | Model Cozy N Safe Fuji i-Size Car Seat 76-150cm, Forward Facing, 5 Point Harness to 105cm, High Back Booster Seat, Side Impact Protection, Adjustable Headrest, 15 Months to 12 Years (Black/Grey) |
BrandMaxi-Cosi | Brand Kinderkraft | Brand Feakaou | Brand Silver Cross | Brand Graco | Brand Graco | Brand COZY N SAFE |
Reviews | Reviews | Reviews  | Reviews | Reviews | Reviews | Reviews |
Tech Specs | ||||||
orientationForward Facing | orientation Forward Facing | orientation Forward Facing、Rear Facing | orientation Forward Facing | orientation Forward Facing | orientation Forward Facing | orientation Forward Facing |
product dimensions59 x 45 x 62 cm; 6.75 kg | product dimensions 48 x 44 x 60 cm 4.8 kg | product dimensions 54.5 x 42.5 x 62 cm; 15.28 kg | product dimensions 57 x 46 x 66 cm 14.1 kg | product dimensions 53.7 x 40.8 x 81.7 cm; 3.49 kg | product dimensions 39.5 x 46.3 x 64.5 cm 4.21 kg | product dimensions 45 x 59 x 42 cm 5.3 kg |
item weight6.75 kg | item weight 4.8 kg | item weight 15.3 kg | item weight 14.1 kg | item weight 3.49 kg | item weight 4.21 kg | item weight 5.3 kg |
maximum weight recommendation36 Kilograms | maximum weight recommendation 36 Kilograms | maximum weight recommendation 36 Kilograms | maximum weight recommendation - | maximum weight recommendation 36 Kilograms | maximum weight recommendation 36 Kilograms | maximum weight recommendation 36 Kilograms |
material typePlastic | material type Polyester, Polypropylene | material type High Density Polyethylene | material type - | material type Alloy Steel, Polyester, Polypropylene | material type Polyester, Alloy Steel, Plastic | material type Plastic |
batteries requiredNo | batteries required No | batteries required No | batteries required - | batteries required No | batteries required No | batteries required No |
material composition22% Steel, 60% PP, 3% ABS, 6% PA, 1% POM, 1% PC, 1% TPR, 4% EPS, 1% EPE, 1% Memory Foam | material composition Polyethylene, Polyester | material composition HDPE 5502 | material composition - | material composition 1.92% Steel, 85.16% plastic, 12.92% polyester | material composition 60 plastic, 10 steel, 30 cotton | material composition Plastic. Polyester |
harness type- | harness type 5-Point | harness type 5-Point | harness type 5-Point | harness type 3-Point | harness type 3-Point | harness type 5-Point |
rear facing maximum child weight36 Kilograms | rear facing maximum child weight 36 Kilograms | rear facing maximum child weight 36 Kilograms | rear facing maximum child weight 21 Kilograms | rear facing maximum child weight - | rear facing maximum child weight - | rear facing maximum child weight - |
number of reclining positions- | number of reclining positions 7 | number of reclining positions 12 | number of reclining positions - | number of reclining positions 10 | number of reclining positions - | number of reclining positions 11 |
minimum height recommendation- | minimum height recommendation - | minimum height recommendation 40 Centimeters of Mercury | minimum height recommendation - | minimum height recommendation 100 Centimetres | minimum height recommendation 100 Centimeter Kilograms | minimum height recommendation 76 Centimetres |
styleTanza i-Size | style Comfort Up I-Size | style - | style - | style R129 Midnight | style - | style - |
minimum weight recommendation- | minimum weight recommendation 9 Kilograms | minimum weight recommendation - | minimum weight recommendation - | minimum weight recommendation 15 Kilograms | minimum weight recommendation - | minimum weight recommendation 9 Kilograms |
forward facing maximum child weight- | forward facing maximum child weight - | forward facing maximum child weight 36 Kilograms | forward facing maximum child weight - | forward facing maximum child weight 36 Kilograms | forward facing maximum child weight - | forward facing maximum child weight 36 Kilograms |
Available On | Available On | Available On | Available On | Available On | Available On | Available On |
Our Top 3 Picks
Here are the top 3 recommended products with more information to help you find the right product for you
9.9
1Maxi-CosiMaxi-Cosi Tanza i-Size, High Back Booster Seat, 3.5–12 years, 100–150cm, Compact Foldable Car Seat, 10 Headrest Positions, G-CELL Side Impact Protection, Padded & Elevated Kids Car Seat, Full Black
Why we love it
Compact and easy to transport.
Adjustable headrest for growing children.
Eco-friendly materials and washable cover.
Main highlights- TRAVEL IN COMFORT: your child can enjoy a comfortable and secure ride throughout their formative years thanks to the padded seat and an elevated seating position for better views
- I-SIZE SAFETY: the ISOFIX car seat is designed according to the highest EU safety standards (i-size ECE R129), while the secure ISOFIX attachments mean you can have confidence through years of use
- GROUP 2/3 CAR SEAT: the multi-age forward-facing car seat effortlessly combines comfort, safety, and convenience on the go and throughout childhood from 100–150cm (approx. 15–36kg)
- G-CELL SIDE IMPACT PROTECTION: this integrated safety system provides expert protection from side impact as it spreads the forces away from your child reducing injury to the head, neck and shoulders
- FOLDABLE CAR SEAT: the portable travel car seat (5.32kg) offers an easy, compact folding design (59.5cm x 28cm x 45cm) that allows you to take it with you, move it from car to car or store it away
- ECO-FRIENDLY PRODUCTION: Eco Care fabrics are made of 20 recycled plastic bottles and without the use of hazardous chemicals, meaning that your child’s skin is not exposed to any potential risks
- 100% RECYCLED FABRICS: the sustainable car seat cover is designed with Eco Care, which means the cover consists of 100% recycled fabrics - it can easily be removed and is machine washable
- 10 HEADREST POSITIONS: the Tanza i-Size car seat offers 10 headrest positions, providing your toddler with extra comfort as it can be adjusted in height as your child grows
-
9.7
2Kinderkraft17% Off
Kinderkraft Comfort UP Car Seat, I-Size Booster Child Seat, with 5 Point Harness, Adjustable Headrest, for Toddlers, Infant, Group 1/2/3, 9-36 Kg, Up to 12 Years, Green
Why we love it
Grows with your child up to 12 years.
Easy installation with three-point seat belt.
11 headrest positions for optimal comfort.
Main highlights- SAFE: Easy installation with a three-point car seat belt, equipped with guides that are comfortable to use; The car seat is equipped with the internal five-point safety harness with soft pads and a crotch protector
- PRACTICAL: The car seat features special elastic bands to hold the safety harness, making it easier to place the child in it; And when you start to fasten your little one with the car seat belt; you can tuck away the internal safety harness without having to remove it from the car seat
- MODULAR INSERT: The car seat is equipped with a soft and comfortable insert for younger children, which is modular and you can easily adjust it to your little one; You can use the insert for a child up to 87 cm tall (the part under the buttocks) or up to 105 cm (headrest)
- FUNCTIONAL: The car seat is suitable for children from 76 cm to 150 cm tall (approximately 15 months to 12 years or 9-36 kg); It is compliant with the latest R129 i-Size standard, it has successfully passed crash tests
- COMFORTABLE: There are 11 headrest adjustment positions, and thanks to the EASY GROW SYSTEM, it offers simultaneous adjustment of the headrest and the internal safety harness; It has a wide, soft seat covered with breathable material
-
9.5
3Feakaou40% Off
Feakaou 360 Car Seat with ISOFIX - for Newborn to 12 Years Children, i-Size (ECE R129/E4) Rotating Swivel Baby Car Seat,Group 0+1/2/3 (40-150cm),Rear Facing for Longer from Birth to 4 Years.Black.
Why we love it
Effortless 360-degree rotation for easy access.
Grows with your child from birth to 12 years.
Enhanced safety with i-Size ECE R129 certification.
Main highlights- Growth Type Baby Car Seat - From birth to 12 years old, with a length of 40-105cm (0-4 years old) suitable for rear facing. The ultra long reverse installation provides better protection for the baby's neck. It can be installed forward or backward from 76-105cm, giving parents more choices. 100-150cm (4-12 years old) forward installation, this high back child car seat can provide additional side protection for children compared to boosters.
- Feakaou Car Seat Has Passed i-Size(ECE R129) Certification - Compared to the old ECE R44, the product is safer because Isize products require side impact testing, while the old standard R44 does not have side impact requirements.
- Easy and Simple Installation, True 360° Rotation - - The seat can be easily installed with Isofix and support legs, and can rotate 360 degrees freely after installation. However, the Isofix+TT fixed safety seat cannot rotate 360 degrees after installation。
- Comfortable Reverse Large Reclining Angle - This is a safety seat that is very suitable for newborns. The reverse seating can achieve a large reclining angle of 165 degrees with the support of the inner cushion, and there are 5 adjustable angles for both forward and reverse directions. When the baby grows up, the headrest can be raised with 12 levels of height adjustment, suitable for children of different heights.
- 360 Spin Car Seat with One Hand - One hand can hold a baby, and the other hand can easily rotate the baby car seat. The 90 side gear is convenient for carrying the baby on and off the car seat.
Our ranking system
The topchoice.co.uk Team selects top-of-the-line items from a wide selection and conducts rigorous evaluations on almost all the products available on the internet. We rank each product based on how well it matches our criteria.We can ensure that the product is well-tested with the help of our expertise, experts, and artificial intelligence technology. topchoice.co.uk requires consistent care for the products we review, ensuring that our assessments are always accurate and up to date.
Features
Our team of experts analyzes key attributes, capabilities, significance, and many more depending on the type of product to determine its effectiveness.
Consumer Reviews
We ensure an evaluation of the ratings using references all over the internet for each product. With the help of our AI technology and professional review teams, we give weight to the worth of individual user experiences.
Popularity
Popularity is an important criterion in choosing a product. Several factors contribute to the popularity of the products on our site, including prestige, relevance, reputation, news, and more.
Value for money
topchoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.
Value for money
topchoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.
