Maxi Cosi Onyx Booster Seat

Regular price: €249.99
Regular price: ~~€290.00~~
Sale price: €249.99

Tax included. Shipping calculated at checkout.

A forward‑facing i‑Size car seat for ages 15 months to 12 years, featuring 5 recline positions, integrated ISOFIX with G‑CELL side‑impact protection, and a memory‑foam headrest, growing seamlessly from harnessed seat to high‑back booster.

Colour – Graphite

Product variants

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