Axkid Up i-Size High Back Booster Car Seat 100-150cm 4-12 Years

i-Size | Child Height: 100 to 150 cm | Age: 4-12 years approx. | Weight: Up to 50 kg

The Axkid Up is an advanced i-Size high-back booster seat designed to provide a tailored fit as your child grows from approximately 4 to 12 years old (100-150cm). Its innovative raisable seat helps achieve an optimal seatbelt position, while a solid steel frame, ISOFIX installation and integrated support leg provide additional stability.

Designed with growing families in mind, the Axkid Up combines long-lasting safety with everyday practicality. Its foldable QuickFold™ design makes installation, storage and moving the seat between cars easier, while ErgoSupport™ and a ventilated backrest help keep growing children supported and comfortable. 

As children grow out of their harnessed car seat, correct vehicle seatbelt positioning becomes particularly important. The Axkid Up takes a different approach to traditional high-back boosters with its patented raisable seat, allowing the seating position to be adjusted as your child grows. 

Suitable from 100 to 150cm and tested up to 50kg, the seat features an adjustable seating height, adaptable headrest and removable side-impact wings to create a more tailored fit for children between approximately 4 and 12 years old. Axkid states that its ProtecBase™ reduces crash forces by up to 25% in its internal crash tests compared with other booster seats. 

The robust construction incorporates a solid steel frame and built-in support leg. When using ISOFIX, the support leg adds further stability. Alternatively, the booster can be installed using the vehicle seatbelt when required, giving families greater flexibility between suitable vehicles

Everyday usability has also been carefully considered. QuickFold™ allows the booster to fold down when it isn't being used and provides a clearer view of the ISOFIX connectors during installation. Its relatively narrow 43.5cm width can also make it suitable for families looking to accommodate multiple child seats, with Axkid stating that three Up seats can be installed side-by-side where vehicle compatibility allows.

For comfort, ErgoSupport™ has been inspired by Swedish school furniture to promote good posture and lumbar support, while ventilation holes in the backrest encourage airflow on longer journeys. 

Important: Axkid recommends keeping children rear-facing for as long as possible, preferably until 125cm, before moving to a forward-facing booster seat. 

• Axkid Up i-Size high-back booster seat
• Integrated support leg
• ASIP side-impact protection
• Axkid Up footrest
• Up footrest is included with the current 2026 configuration listed by Axkid 

• Suitable for children from 100-150cm
• Approximately 4-12 years
• Approved up to 50kg
• i-Size high-back booster seat
• Patented raisable seat design
• Solid steel frame
• ISOFIX and support leg installation option
• Vehicle seatbelt installation option
• QuickFold™ foldable design
• ErgoSupport™ for ergonomic comfort and posture
• Adjustable headrest and seating position
• Removable side-impact wings
• Ventilated backrest
• Removable, machine-washable cover
• Narrow 43.5cm overall width 

• Patented raisable seat – Adjusts the child's seating height, helping achieve an appropriate vehicle seatbelt position as they grow.
• 100-150cm height range – Designed to provide long-term use throughout the high-back booster stage.
• Up to 50kg – Tested for children weighing up to 50kg.
• ISOFIX installation – Provides a quick and stable connection to compatible vehicles.
• Integrated support leg – Adds extra stability when the seat is installed using ISOFIX.
• Flexible installation – Can also be installed using the vehicle seatbelt where required.
• QuickFold™ design – Folds compactly to simplify storage, transportation and access to the ISOFIX connectors.
• ErgoSupport™ – Provides ergonomic support and promotes a comfortable seating position, particularly useful on longer journeys.
• Adjustable fit – Adjustable seating height, adaptable headrest and removable side-impact wings help accommodate your growing child.
• Ventilated backrest – Perforations encourage airflow for improved comfort.
• Easy-care fabrics – The removable cover can be machine washed at 30°C.
• Slim profile – At 43.5cm wide, the Up provides greater flexibility where several child seats need to be fitted across a vehicle's rear seats. 

• Car Seat Type: High-back booster
• Approval: i-Size
• Child Height: 100-150cm
• Approximate Age: 4-12 years
• Maximum Approved Weight: 50kg
• Installation: ISOFIX with support leg or vehicle seatbelt
• Width: 43.5cm
• Height without support leg: 83cm
• Depth: 63.6cm
• Seating Depth: 42cm
• Minimum Seat Height: 5.9cm
• Maximum Seat Height: 14.6cm
• Product Weight: 9.5kg
• Folded Width: 43.5cm
• Folded Height: 25.4cm
• Folded Depth: 63.6cm
• Seat Ventilation: Yes
• Removable Cover: Yes
• Cover Care: Machine washable at 30°C
• ASIP: Included
• Footrest: Included

The Axkid Up is designed for installation using ISOFIX together with its support leg, or using the vehicle's seatbelt where appropriate. Always check your vehicle compatibility and follow the Axkid installation instructions before use. 

Ideal for:

• Growing children from 100-150cm
• Families transitioning to a high-back booster after extended rear-facing
• Everyday school and nursery journeys
• Longer family car journeys
• Families regularly transferring a booster between vehicles
• Cars where a narrower booster seat is beneficial
• Families who need to accommodate multiple child car seats across the rear seats