Maxi Cosi Onyx Booster Seat
- Regular price
-
€249.99 - Regular price
-
€290.00 - Sale price
-
€249.99
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Product Info
The Maxi Cosi Onyx is a versatile forward facing car seat engineered to accompany your child’s journey from toddlerhood through pre teen years.
Fully compliant with the latest i Size (R129/03) safety regulations, it offers top-tier protection with integrated ISOFIX connectors and G CELL side impact panels, along with a 5 point safety harness for young children—stowable to transform the seat into a convenient high back booster as they grow.
Comfort is prioritized with five incline options, ideal for everything from snack breaks to nap time, and a memory foam headrest that cushions during journeys. The adjustable setup—featuring ten headrest heights and a fully adaptable harness—makes fitting easy as your child grows.
Designed for practical family life, the Onyx is made with 100% recycled “Eco Care” fabrics and features a machine-washable cover (30 °C). The absence of bulky armrests makes buckling effortless—even for independent kiddos.
Weighing around 11kg, it’s a durable yet manageable addition to your vehicle.
Features
- G-CELL Side Impact Protection: Advanced technology absorbs and disperses crash forces for enhanced safety.
- 5-Point Safety Harness: Secures children up to 105 cm, then stows away for booster mode.
- Five Recline Positions: Adjustable settings ensure comfort during every journey.
- Height-Adjustable Headrest: Adapts to your child's growth for continued support.
- Eco-Friendly Materials: Covers made from 100% recycled fabrics; machine washable at 30°C.
- Age Suitability: 15 months to 12 years (76–150 cm)
- Installation: ISOFIX connectors with top tether
- Safety Standards: i-Size (R129/03) compliant
- Dimensions: Height: 52 cm; Width: 30 cm; Depth: 30 cm
- Weight: Approximately 9–36 kg
- Product Weight: 11kg
- Materials: Memory foam headrest; 100% recycled fabric covers
Delivery
Delivery within ROI is free for orders over €30. Orders placed before 1pm will be delivered next working day.
Delivery to UK is free for orders over £80. Orders placed before 1pm will be delivered in 2 working days.
For customers in mainland Europe a shipping rate will be applied at checkout.












Maxi Cosi Onyx Booster Seat
- Regular price
-
€249.99 - Regular price
-
€290.00 - Sale price
-
€249.99