10 Best Narrow Booster Seat 2025 in the UK

The BubbleBum Inflatable Booster Car Seat is a unique, travel-friendly option designed for kids aged 4 to 11 years who weigh between 15 and 36 kilograms (about 33 to 79 pounds) and are up to 135 centimeters tall. Its slim, narrow design is ideal for fitting three children across a back seat, especially in smaller cars or the middle seat where space is limited. This booster is lightweight (just 500 grams) and inflatable, making it extremely portable and easy to carry around for vacations, taxis, or carpooling. Safety is well covered, as it meets US, UK, and European safety standards and includes a seat belt positioning clip to ensure the belt fits correctly and comfortably.

The seat’s materials are durable and similar to those used in life vests, with energy-absorbing memory foam inside, enhancing comfort and protection. Installation is straightforward—no assembly required, and inflating the seat is quick. Being backless, it may not offer the same level of support or security as booster seats with backs or harnesses, which some parents might prefer for longer trips or younger children. While it’s great for travel and occasional use, it might not be the best everyday booster in terms of comfort during long drives since it lacks extra padding or features found in bulkier seats.

In summary, BubbleBum is an excellent choice if you need a compact, portable booster that fits in tight spaces and meets safety rules. However, it might feel less plush and supportive compared to larger traditional booster seats.

The Graco Junior Maxi i-Size R129 highback booster is designed for children roughly between 3.5 and 12 years old, fitting kids from 100 to 150 cm tall and up to 36 kg. Its 10-position adjustable headrest makes it easy to customize the fit as your child grows, which is a big plus for long-term use. Safety is supported by open-loop belt guides that help keep the car’s seatbelt correctly positioned, meeting the modern R129 (i-Size) standard, which is reassuring for parents wanting up-to-date protection.

The booster is relatively lightweight at about 3.5 kg, making it easier to move between cars if needed, and it installs using the vehicle's seatbelt, which can be straightforward for most users, though it lacks added ISOFIX connectors for extra stability. Comfort-wise, the seat features a soft cushioned pad and retractable cupholders, useful on longer trips. It’s built from durable materials like polyester and alloy steel, so it should hold up well under regular use.

The size is moderate, not too bulky, making it suitable for smaller cars or tighter spaces, which fits the narrow-booster-seat category. One downside might be that it doesn’t recline, so comfort adjustments are limited to the headrest height. Also, since it uses a 3-point seatbelt rather than a harness, very young children closer to 3.5 years old might find it less secure than harnessed seats. This booster seat offers a solid combination of safety features, comfort, and adaptability for growing kids, making it a good choice for parents looking for a reliable highback booster that fits a range of child sizes and car interiors.

The Jovikids I-Size Booster Seat is designed for children aged 6-12 years, fitting comfortably within the height range of 125-150cm. Approved by the ECE R129 standard, this booster seat prioritizes safety with features like a belt guide to ensure the car's 3-point seatbelt is correctly positioned over the child's shoulder, reducing the risk of misalignment during travel. Weighing only 3 kg, this seat is lightweight, enhancing its portability and ease of maneuvering between vehicles, which is useful for families who frequently switch cars.

The compact dimensions (41 x 44 x 25 cm) further support its portability, making it a practical choice for travel. The seat's removable and washable cover offers ease of maintenance, though it might lack sophistication compared to seats with additional features like padding or more elaborate adjustability options. Comfort is assured with a padded cover and armrest, though some children might prefer booster seats with more advanced ergonomics.

Installation is straightforward using the car's seatbelt, aligning with the product's promise of convenience across different car models. However, it does not include ISOFIX, a more secure installation method, which may be a drawback for parents seeking the utmost security. The durable polyethylene material ensures longevity, although some users might desire a more luxurious fabric for aesthetic or comfort purposes. It earns a high customer rating of 4.7 out of 5 stars, indicating satisfaction with its balance of safety, convenience, and comfort. This product is best suited for parents looking for a reliable, portable booster seat that meets essential safety standards without the need for advanced features.