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Maxi Cosi Onyx Group 1/2/3 Car Seat - Graphite
Begin your journey to parenthood with Maxi-Cosi and they will always reward you with the highest levels of quality. Maxi-Cosi children’s products maximise safety and comfort so parents can focus on enjoying those precious moments with little ones. With over 30 years of industry experience, you can rest assured Maxi-Cosi will confidently see children through the first day of nursery, birthdays, road trips, park picnics, and each and every moment in between.
You can always rely on Maxi-Cosi child car seats to transport your babe from A to B without skimping on safety – after all, they have carried 50 million little ones home from the hospital safely and soundly. And when it’s time to hop out of the car and go on an adventure with your child, choose from a selection of Maxi-Cosi strollers designed to suit every lifestyle.
With Maxi-Cosi, you can have peace of mind that they will fulfil their promise – ‘whatever the future carries, we carry the future.’ Long-lasting family memories await you and your little treasure – so what are you waiting for?
Warning: Last items in stock!

Onyx - provides your growing child (76 – 150 cm) with the very best protection whenever you’re on the road. With integrated G-CELL panels and a 5-point safety harness, they’re fully protected in the event of forward as well as side collisions. And thanks to its five comfortable recline positions, your little one has the cosiest seat in the car every time you hit the road.
Safety - Onyx is designed for safe journeys together. It meets the highest and latest i-Size safety standards and keeps your child protected throughout childhood. Its integrated G-CELL panels provide the very best protection in the event of side collisions, while the 5-point safety harness offers the most secure fit as they grow.
Ease of use - Each day is made easier with Onyx. Its 5-point safety harness can be used up to 4 years (105 cm), and after that, you can store the harness away in the seat to convert the car seat to booster mode. Your little one can then be buckled up quickly and easily using the car’s seat belt.
Age range - Onyx is the multi-age car seat that’s designed to grow with your child. It can be used from 15 months all the way up to 12 years old (76 – 150 cm). It adapts to their changing needs as they grow thanks to its height adjustable headrest and high back booster design.
Comfort - Your child can make use of five recline positions that keep them comfortable whenever using Onyx in harness mode. Whether they’re taking a nap on a long journey watching the world go by outside the window, Onyx ensures they remain cosy and comfortable in their seat.
The below delivery options and delivery times only apply once your order is in stock with us. Your order may be on a lead time or pre-order so once the stock is with us, these are your delivery options and timeframes.
Standard Delivery
*These charges are location dependant, please see our Delivery Info Page for more information
Express Delivery
Our Express Delivery Service is available for £5.99 and can be selected at checkout on eligible products.
The delivery estimate displayed on each product page shows when your item is expected to arrive into stock. All lead times provided are estimates and are based on working days (Monday–Friday, excluding public holidays).
In Stock
Items showing as available for Next Day Delivery are held in our warehouse and can be dispatched the same day when ordered before 3:00pm (Monday to Friday) if you choose the Express service at checkout.
Direct Delivery
Some products are shipped directly from the manufacturer. The estimated delivery timescale will be displayed on the product page.
Supplier Stock Lead Times
Some items are available from our suppliers and are ordered specifically for you. Delivery times vary by product and are clearly displayed on the product page.
Pre-Order Items
Pre-order products can be reserved before they arrive back in stock.
Where an estimated availability date is provided, this is supplied by the manufacturer and may be subject to change. If there are any significant delays, our team will contact you with an update.
If your order contains items with different lead times, your order will normally be dispatched together once all items are available. This means your estimate delivery date for the full order will be based on the longest lead time in your basket.
If you would prefer available items to be sent sooner, please contact our customer service team who can arrange this for you.