If you've been searching for a high-back booster that won't take over the back seat, weigh a tonne, or leave you wrestling with a complicated installation every morning, the Avionaut Sky 2.0 has almost certainly come up on your radar. It's become one of the most talked-about seats in the UK's forward-facing booster category — and after spending a good amount of time with it here at Saunders & Smalls, we think the attention is largely deserved.
This is our honest, updated review. We'll walk you through what makes the Sky 2.0 stand out, where it has its limitations, and who it's best suited to. No fluff — just the things that actually matter when you're making a decision this important.
What Is the Avionaut Sky 2.0?
The Avionaut Sky 2.0 is a Group 2/3 high-back booster seat, designed for children from approximately 15 kg up to 36 kg (roughly 3.5 years through to around 12 years, depending on your child's build). It meets the ECE R44/04 safety standard and is used in the forward-facing position with the car's own three-point seatbelt.
It's made by Avionaut, a Polish manufacturer that has steadily built a strong reputation in the UK for producing lightweight, thoughtfully designed seats. You might already know them from the Avionaut Maxspace Airflow, which has been a firm favourite here for older toddlers and young children.
The Sky 2.0 is very much aimed at the slightly older child — the one who has grown out of a harnessed seat and needs something that works well with a seatbelt, but still offers proper head and side protection.
Safety note: UK law requires children to use an appropriate child restraint until they are either 135 cm tall or their 12th birthday (whichever comes first). A high-back booster like the Sky 2.0 is the correct choice for this stage — never move a child to a seatbelt alone before they meet these criteria.
What We Like About the Avionaut Sky 2.0
This is where the Sky 2.0 genuinely earns its reputation. There are several things about this seat that make it a pleasure to use day to day.
Remarkably Light
At just over 3 kg, the Avionaut Sky 2.0 is one of the lightest high-back boosters on the market. If you regularly move the seat between cars, take it on holiday, or just find yourself hauling it in and out of the boot, that weight difference is very noticeable compared to heavier competitors. For families with smaller vehicles or those who share school run duties across two cars, this is a genuine selling point.
A Slim, Space-Saving Profile
One of the most consistent pieces of feedback we hear from parents in-store is about space. Whether you've got a compact car like a VW Polo or you're fitting three seats across the back of a family car, width matters. The Sky 2.0 has a pleasingly slim profile that makes it much easier to fit alongside other seats without forcing uncomfortable compromises. If you're navigating tight back-seat space more broadly, our guide to rear-facing car seats for small cars covers the key considerations well.
Adjustable Headrest and Side Wings
The headrest on the Sky 2.0 adjusts easily with one hand, which sounds minor but makes a real difference in daily use. The side impact protection wings are positioned to move in line with the headrest, keeping your child's head properly supported as they grow. Head protection is where a lot of budget high-back boosters cut corners — this one doesn't.
Ventilation and Comfort
Avionaut clearly put thought into the fabric and airflow design on this seat. The breathable cover helps prevent that sweaty-back feeling on longer journeys, and the padding strikes a sensible balance between comfort and support. Our experience, and the feedback from customers, is that children genuinely find it comfortable — which matters enormously for everyone's sanity on a long drive.
Easy to Keep Clean
The cover unzips and can be removed for washing, which any parent of a snack-happy three-year-old will appreciate immediately.
Where the Avionaut Sky 2.0 Has Limitations
In the spirit of honest reviewing, there are a couple of things worth knowing before you buy.
- No ISOFIX. The Sky 2.0 is not an ISOFIX seat — it sits in the car using the seatbelt alone. For most parents this is absolutely fine, but if ISOFIX is a non-negotiable for you, it's worth knowing upfront.
- R44, not i-Size. The Sky 2.0 is approved to the older ECE R44/04 standard rather than the newer i-Size (R129) standard. R44 remains a fully legal and valid safety standard in the UK, so this isn't a safety concern — but if you specifically want i-Size certification, you'll want to look at alternatives.
- Belt routing requires care. As with all seatbelt-only boosters, correct belt routing is essential. The seat guides the belt into the right position, but it's worth taking a few minutes to check it's fitted correctly. If you're ever unsure, we offer car seat fitting appointments at our Somerset store — we're always happy to help.
Who Is It Best For?
The Avionaut Sky 2.0 is an excellent choice if:
- Your child has outgrown a harnessed seat and is ready to move to a seatbelt booster
- You want something lightweight and easy to move between vehicles
- Space in the back of your car is limited
- You travel frequently and want a seat that works well in taxis, hire cars, or family members' vehicles
- Comfort on longer journeys is a priority
It's less ideal if you're specifically looking for an ISOFIX seat, or if you want the newer i-Size certification.
How Does It Compare?
At Saunders & Smalls, we only stock seats we genuinely believe in — so it's worth mentioning that the Sky 2.0 sits alongside some strong alternatives. If your child is still in the harnessed rear-facing stage, the Avionaut Maxspace Airflow is worth a look — and our in-depth review of why the Avionaut Maxspace Airflow is the ideal car seat for your child goes into even more detail. For parents weighing up high-back booster options more broadly, our essential guide to high-back booster seats covers the key decisions well.
The Sky 2.0 occupies a particular sweet spot: it's genuinely well-made, extremely practical, and priced accessibly without feeling like a compromise. That's not a combination you find all that often.
Our Verdict
The Avionaut Sky 2.0 does what a good high-back booster should do — it keeps children safe, comfortable, and properly supported — but it does so in a package that's notably lighter and slimmer than most of the competition. For parents who prioritise practicality alongside safety, it's a very sensible choice.
It won't be the right seat for every family. But for the family that needs a reliable, easy-to-use booster that genuinely fits into real life, it's hard to argue with.
Browse the Avionaut Sky 2.0 and our full range of high-back booster seats at Saunders & Smalls — and if you'd like to see it in person, we'd love to see you in store in Wincanton, Somerset.
