InfaSecure Ultimate Booster Seat (4 Years to 10 Years)

Designed and developed right here at home, in Australia



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Ultimate Booster Seat 

Ultimate Onyx is a Type F Booster Seat that is suitable for children aged between approximately 4 and 10 years old.

Ultimate features Push & Lift, an Adjustable Locking Headrest, enabling the seat to grow with your child. With the ease of use and portability in mind, the folding feature on the Ultimate Onyx makes storage and transport quick and easy. This child retsraint uses the vehicles adult lap & sash belt and features a top tether strap for simple installation. Ultimate Onyx is the tallest Booster Seat in our range on the New Zealand market.  

Air Cocoon Technology™ (A.C.T)

Ultimate Booster features Air Cocoon Technology™ (A.C.T) This enhances side impact protection through blow moulding design, dramatically reducing the impact forces during a crash. The blow moulded backrest and side wings act like airbags. This greatly reduces the forces on a child’s head and body in a side impact accident.

Active Fabric™

Ultimate also features Active Fabric™ The easy-care Active Fabric™ covers are hard wearing, cool, and breathable. The machine-washable, press-stud covers and inserts can easily be removed for cleaning without having to uninstall the restraint. 

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Warranty:12 Months (Cover) / Lifetime (Shell) – (Click for details)


  • Forward Facing Booster from 4 to 10 years
  • Large seatbelt sash guides
  • Secur-air™-  Triple Layer Crash Protection
  • Air Cocoon Technology™(A.C.T.) integrated
  • Adjustable locking headrest
  • Press-stud attached covers – remove without uninstalling
  • Easy install belt path
  • Vehicle seat protector included


  • Width (Widest Point) – 44cm
  • Height (Headrest Down) – 76cm
  • Height (Headrest Up) – 86cm
  • Depth (Seat Base) – 41cm

Approximate Shoulder Height Marker Locations

  • Lower Marker (Start Use) – 38.5cm
  • Upper Marker (Stop Use) – 56.5cm
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