Maxi-Cosi Onyx i-Size Car Seat - Full Graphite

Maxi-Cosi Onyx i-Size Car Seat — Safety & Comfort That Grows With Your Child

Keep your child safe and comfortable on every journey with the Maxi-Cosi Onyx i-Size Car Seat in sleek Full Graphite. Designed for children aged 15 months to approximately 12 years (76–150 cm), this seat offers outstanding protection and comfort, adapting effortlessly as your little one grows.

Featuring integrated G-CELL side impact protection panels and a secure 5-point safety harness, the Onyx shields your child from forward and side collisions, meeting the latest i-Size safety standards for peace of mind on the road.

Thanks to its adjustable headrest and high back booster design, the Onyx grows alongside your child. When they’re ready, the harness can be easily removed and stored, converting the seat into a booster for older kids. Five recline positions ensure your child stays comfortable, whether on short trips or longer drives.

Key Features:

• Meets highest i-Size (R129) safety standards for children 15 months to approx. 12 years

• Integrated G-CELL side impact protection panels for enhanced safety

• 5-point harness for secure restraint, easily removable when converting to a booster seat

• Adjustable headrest and high back booster for long-lasting use

• Five recline positions for superior comfort on every journey

• Suitable for children from 76 cm to 150 cm (approx. 9–36 kg)

Specifications:

• Car Seat Weight: 11 kg

• Child Weight Range: 9 – 36 kg

• Dimensions (W x H x D): 44.4 x 80.2 x 52.3 cm

• Age Range: From 15 months up to approx. 12 years

For new items

We offer 28 day returns, as long as the item comes back to us as new. If the packaging has been opened we deduct 10% so we can pass it on as open box. Return postage is at your cost unless the item is faulty. You'll find the full details on our Returns & Refunds page.

For pre-loved items

Pre-loved items are sold as seen, as the manufacturer's warranty ends when ownership changes. If it isn't quite right, you have 28 days to return it at your own cost, with a £25 admin fee deducted. And if a fault appears within 3 months of purchase, we'll cover the repair. The full details are on our Returns & Refunds page.