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R129 & i-Size logo 
R129 & i-Size Certified
GrowTogether™ headrest and harness
multi recline 
4 recline positions
product details


  • Meets the highest ECE R129/03 safety standard, including side-impact testing
  • Meets i-Size certification in forward facing belted booster mode
  • 5-point harness with soft, padded covers keeps your child cosy and secure by protecting the strongest points of their body
  • As headrest raises, AutoAdjust™  side wings widen to allow more shoulder space for growing kids.
  • Soft, cosy comfort meets hardcore safety with a resilient reinforced steel inner shell



  • On-the-go recline adjusts to 4 positions
  • Plush, deluxe cushioning and fabrics keep little ones cosy
  • High back support holds belt positioning in proper place and provides a comfortable spot for kids to rest their heads



  • A 9 position headrest that will easily adjust to the perfect height with just one hand
  • Accommodate those unexpected growth spurts with our Grow Together™ headrest and harness system that adjusts simultaneously… even while the seat is installed
  • Easily clean up messes with removable, machine washable covers 
  • Colour coded guides clear the path to simple and intuitive installation.

Product dimensions: l 70 x w 46.5 x h 49.5 cm

Product weight: 7.95 kg

Product usage: harness 76 - 105 cm Belted Booster 105 - 145 cm

Testing Certification: ECE R129/03

how to & support
Black Joie Fortifi R129 facing towards the right at an angle

highest standards

Now tested to the highest ECE R129 testing standards fortifi™ R129 is safer than ever and i-Size certified in belted booster mode.

Smiling child in black Joie Fortifi R129 seat looking at mom

keep them safest

5-point harness with soft, padded covers keeps your child cosy and secure by protecting the strongest points.

Black Joie Fortifi R129 facing to the right

easiest of installs

well-marked, colour-coded green installation paths and dual lock-offs for installing with the vehicles 3-point seat belt.

Closeup of black Joie Fortifi R129 with headrest raised

easy adjustments

One-hand 9-position GrowTogether™ headrest and harness adjust simulataneously, no re-threading needed.

Black Joie Fortifi R129 forward facing with headrest raised

grow with you

AutoAdjust™ side wings widen as headrest is raised for shoulder space.

no such thing as too safe

Your baby gear should work hard for you every single day. That’s why we push our products to the extreme during testing: We want to make sure they’re up for any challenge you may face.

super strength materials

We use only high-quality materials in creating your gear: like aero-grade aluminium, super-strength steel and undiluted plastics.