The upgraded original 2-in-1 expandable booster

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Monterey® 2XT


Welcome a world of flexibility with Monterey 2XT. Suitable from 40 - 120 lbs approx. 4 - 12 years. We all know that children grow at different rates, and not one size fits all. As one of the most flexible car seats you’ll find, Monterey 2XT is lightweight, super portable and with adjustable headrest and expandable sides, ensures a proper fit for your little one at every age. Featuring 11 headrest positions and 2 recline positions, Monterey 2XT can adapt quickly to growing children, with plenty of room for shoulders, hips and legs. A simple-to-use dial on the back adjusts the width of the seat up to 20” wide, while the headrest adjusts up to 6.5” in height with one hand for an easy precise fit. Clever design thinking and award-winning safety features make the Diono difference. That’s why the Monterey 2XT includes our superior side impact protection with aluminum reinforced head support and energy absorbing EPS foam, to accommodate growth spurts without sacrificing protection. Equipped with simple connectors and front adjusters, Monterey 2XT can securely connect to your vehicle in seconds, enhancing safety and stability as well as allowing parents to switch between vehicles with ease. Lovingly engineered for every journey with two retractable cup holders to keep drinks or snacks upright and within reach, so both children and parents can sit back and relax.



Provides 69% increase in occupancy space as your child grows


Easily converts into a backless booster seat, with a wide contoured seat base and 2x fold away drink and snack holders


Reinforced high impact aluminum that provides layers of enhanced side impact protection for head, shoulders and torso


Easy one hand adjustment provides up to 6.5” in height to grow with your child. Ultimate safety and protection for your child comfort


Weighing only 14.3 lb (6.5 kg), Monterey® 2XT is super light allowing you to move the seat between vehicles with ease

Product Specs

  • Minimum User Weight: 40 lb / 18 kg

  • Maximum User Weight: 120 lb / 54 kg

  • Maximum User Height: 63 in / 160 cm

  • Product Height: 27.2 in / 69 cm

  • Product Width: 22 in / 55.9 cm

  • Product Depth: 17.5 in / 44.5 cm

  • Seat Weight: 14.3 lb / 6.5 kg

  • Number of Head Support Positions: 11

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® 2XT - diono® booster seat

Diono Engineering

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

Monterey® 2XT - 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® 2XT - 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® 2XT - 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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