Reviews

Nuna AACE Booster review

nuna aace booster seat review
Nuna Aace Booster Seat Review
⚠️ Not recommended

Nuna Aace Booster Seat Review 🪑

Is the Nuna Aace booster seat worth the expense? Read our honest, independent review.

⭐ ⭐ ☆
☆
☆

2 out of 5

Recommended

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Summary: Not recommended

The Nuna Aace Booster is just a booster using the adult lap-sash seat belt. At current retail (RRP $269 vs $199), it costs around 35% more than the trusted Britax Hi-Liner, which we have used for many years. The Nuna Aace does not have an anti-submarining clip to prevent your child from sliding under the lap section of the seat belt.

Nuna Aace Booster seat review

📏 Nuna Aace booster — wide seat

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The width of the Nuna Aace is very wide at 50–56 cm, compared to the Britax Hi-Liner width of 41 cm. When placed in your car, there is a high chance the booster will sit on top of the seat belt buckle, making it difficult to buckle the booster.

This problem is even worse when the car seat has contours — your child may end up sitting at an angle.

🚙 Three car seats across

The Nuna Aace cannot be used when fitting three car seats across the middle row. Its width (50–56 cm) means it will not fit into the middle position without sitting on at least one seat belt buckle.

✕ The armrests also make it difficult to connect the seat belt when placed close to another seat — this is a complete fail.

💡 When you need a booster seat that fits three across, it is highly recommended to use the Kid Guard Pro.

Nuna Aace Booster Expanded Wings

🪽 Expandable wings

The expandable wings allow children with wider shoulders to fit more comfortably. The mechanism widens the wings by raising the headrest.

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Lifting the headrest is easy initially, but widening the wings becomes significantly harder — many parents will struggle with it.

🌬️ Ventilated shell

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The ventilated shell is an attempt at adding a feature to the booster seat, but it has little chance of actually working. Unlike the Britax B-First, which has real airflow channels, the Nuna Aace’s ventilation holes have almost no airflow from under or behind the seat.

❓ Frequently asked questions

Is the Nuna Aace booster seat safe? ＋
It meets Australian standards, but it lacks an anti-submarining clip to stop your child sliding under the lap belt, and its unusually wide shell (50–56 cm) makes it hard to buckle correctly in many vehicles.
Why is the Nuna Aace not recommended? ＋
At current retail, it costs around 35% more than the Britax Hi-Liner ($269 vs $199), doesn’t have an anti-submarining clip, is too wide to fit three seats across, and its ventilation feature offers little real airflow compared to competitors.
Can the Nuna Aace fit three seats across the back row? ＋
No — its 50–56 cm width means it won’t fit in the middle position without sitting on a seat belt buckle, and the armrests make it hard to buckle when placed next to another seat.
What’s a better alternative to the Nuna Aace? ＋
The Britax Hi-Liner is a trusted, more affordable option we’ve used for years. If you need to fit three seats across the back row, the Kid Guard Pro is a better fit.
Does the ventilated shell actually work? ＋
Not really — the ventilation holes have almost no real airflow from under or behind the seat, unlike seats such as the Britax B-First which use genuine airflow channels.
Should I get professional advice before buying a booster seat? ＋
Yes — booster fit varies a lot between vehicles, especially with wider seats like the Aace. An ACRI-accredited fitter can check compatibility with your specific car before you buy, saving you from an expensive mistake.
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