The original 2-in-1 expandable booster

More stock expected late July/early August

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Monterey® XT


The original expandable booster, with easy one hand height and width adjustment to provide 69% increase in occupancy space. Suitable from 40 - 120 lb. (18 - 54 kg), approx. 4 - 12 years.



11 headrest positions and expandable side walls provides 69% increase in occupancy space as your child grows.


Easily converts from a high back booster to a backless belt positioning booster seat with wide contoured seat base and two retractable cup holders.


Extra deep aluminum reinforced sides provides side impact protection for their head, shoulders and torso.


Equipped with LATCH connectors and front adjusters to securely connect the booster seat to your vehicle in seconds, enhancing safety and stability.


Weighing only 13 lb. (5.8 kg) the Monterey XT booster seat is super light allowing you to move the seat between vehicles with ease.

Product Specs

  • Maximum User Height: 63 in / 160 cm

  • Number of Head Support Positions: 11

  • Minimum User Weight: 40 lb / 18 kg

  • Maximum User Weight: 120 lb / 54 kg

  • Minimum User Weight - Forward Facing: 40 lb / 18 kg

  • Maximum User Weight - Forward Facing: 120 lb / 54 kg

  • Product Width: 20 in / 50.8 cm

  • Product Height: 26 in / 66 cm

  • Product Depth: 16 in / 40.6 cm

  • Seat Weight: 13.9 lb / 6.3 kg

Care & Maintenance

Covers: Front loader only, gentle cycle machine wash cold, line dry.

Shell and Components: Spot clean

Warranty Information

12 months standard warranty

The Diono Difference

Monterey® XT - diono® booster seat

Diono Engineering

All Diono boosters are designed and engineered to go over and above safety standards.

Monterey® XT - diono® booster seat

Original expandable booster

The Diono Monterey® is the original expandable booster seat, engineered with both height and width adjustment for a custom fit at every age.

Monterey® XT - diono® booster seat

8 Years One Booster

One thing all parents know, kids will keep on growing! Diono boosters are suitable from 40 - 120 lb (approx. 4 - 12 years) for 8 years of use.

Monterey® XT - diono® booster seat

Designed for every journey

Integrated LATCH connectors and front adjusters make for a simple and safe installation every time.

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