Britax Advansafix Pro Convertible Car Seat

Remember taking a favourite toy on all your adventures? The ADVANSAFIX PRO will be your little one's faithful friend too — always there when they need it. Designed to grow with your child and approved to the latest i-Size safety standard (UN R129), it gives ultimate protection on every journey. Simply convert from a harnessed seat to a highback booster in a few easy steps — suitable from 15 months right up to 12 years (76–150 cm).

Ultimate safety

Give your child maximum protection on every journey. The 5-point harness can be used right up until your little one reaches 105 cm (max. 22 kg), so you can rely on the ADVANSAFIX PRO to keep them safe for longer. Developed and approved to the latest i-Size standard (UN R129), it combines three advanced safety technologies working together: SICT (Side Impact Cushion Technology) reduces the force of a side impact by up to 40%, the XP-Pad reduces abrupt forward head movement by up to 30% to protect the neck, and SecureGuard reduces abdominal forces by up to 35% by guiding the lap belt into the correct position.

Comfort and flexibility as they grow

Give your little one a comfortable ride — even when they're not so little anymore. From toddler to tween, the spacious, softly padded seat and headrest adjust effortlessly so you create the perfect fit at every stage. Soft, removable Performance Chest Pads add comfort to the 5-point harness and reduce your child's movement in a collision — and they lift off for washing. Switching from the 5-point harness to your car's seat belt means there's no need to buy another car seat — the ADVANSAFIX PRO protects your child from 15 months to 12 years. Busy day of adventures? EasyRecline gives three recline positions you can adjust while your child stays seated, so even a bigger child can nap comfortably.

Peace of mind for parents

Relax — there's no need to buy a new car seat as your toddler gets bigger. The lightweight ADVANSAFIX PRO grows and protects your child throughout their childhood, and the headrest and harness adjust together so you're always ready to get out and about after another growth spurt. Once your child reaches 100 cm, switch from the integrated 5-point harness to your car's 3-point seat belt with the FLIP&GROW function — booster mode then takes them all the way to 150 cm.

LUX collection

Both colours in this listing are from the Britax Römer LUX collection — luxurious, sustainable fabrics made largely from recycled yarn (including SeaWool), with soft seat liners, colour-matched zips and elegant leatherette details. Available in Soft Taupe and Linen Grey.

Key features

• i-Size (UN R129) — grows from 76 cm to 150 cm (15 months to ~12 years)
• FLIP&GROW — converts from 5-point harness to highback booster (3-point belt) from 100 cm
• 5-point harness usable to 105 cm / max. 22 kg
• SICT — reduces the force of a side impact by up to 40%
• XP-Pad — reduces abrupt forward head movement by up to 30%, protecting the neck
• SecureGuard — reduces abdominal forces by up to 35% with correct belt routing
• Soft, removable Performance Chest Pads (washable)
• EasyRecline — 3 recline positions, adjustable while seated
• Installation: ISOFIX + Top Tether (harness, 76–105 cm); vehicle belt with or without ISOFIX (booster, 100–150 cm)
• LUX sustainable fabrics; quick-remove washable cover

Dimensions & installation

Forward-facing. Harness mode installs with ISOFIX + Top Tether (76–105 cm); booster mode uses the vehicle 3-point belt, with or without ISOFIX (100–150 cm). Seat dimensions (H × W × D): 60–83 × 44 × 48 cm (height adjustable with the headrest). Seat weight approx. 10 kg.

Good to know

Available in Soft Taupe and Linen Grey (both LUX collection). Backed by the Britax Römer manufacturer warranty.