Osann Boost Isofix R129 Belt Guide Booster Cushion


1 in stock


  • Suitable for use from 126cm to 150cm in height.
  • Large anatomically profiled seat for additional comfort.
  • Comfortable armrests.
  • Proper belt guidance through the belt guide.
  • Removable upholstery, easy to wash at 30 degrees.
  • Integrated Gurtfix: controls the course of the diagonal belt.
  • Hybrid Isofix solution: the seat can be installed with or without Isofix. The Isofix connectors can be simply stowed away when not in use.
  • The base complies with the European i-Size safety standard for car seats.



Osann Boost Isofix R129 Belt Guide Booster Cushion

Discover the reliable car seat base, Osann Junior Isofix i-Size with belt guide. It really offers exceptional flexibility in installation while also meeting the highest safety standards. Firstly, this car seat base can be securely attached using either the Isofix system or the 3-point car belt. Secondly, the Isofix system certainly ensures a quick and proper installation. As well as having the added advantage of the retractable Isofix connectors that can be individually adjusted to fit your specific car model.

The seat can be used from a child’s height of 126 cm up to 150 cm.


The seat is designed for children with a height ranging from 126 cm to 150 cm.


For increased safety, the booster cushion is compliant with the latest standard for child car seats, ECE R129 (i-Size).

Hybrid Mounting Type:

The seat can be mounted facing forward using either the Isofix system or car belts. Depending on the type of installation, the Isofix connectors can be easily stowed or extended.

Belt Guide:

The Belt Guide also ensures optimal belt guidance, allowing for individual adjustment to the child’s height and preventing the shoulder belt from cutting into the child’s neck.

Adjustable Isofix Connectors:

The Isofix connectors have adjustable lengths, enabling easy and individual adjustment of the seat to your specific car model.


  • Weight: 3.3 kg
  • External dimensions: Width 44 cm x Height 25 cm x Length 38 cm
  • Seat dimensions: Width 34 cm x Depth 34 cm
What does R129 regulations mean?

R129 is the most up to date safety standard for car seats.

Main features of R129 car seats:
-Tested by the height of your child rather than weight
-Advanced side impact protection testing
– Extended Rearward Facing- children must be rearward facing until at least 15 months

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