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  3. Monterey® 4DXT

Monterey® 4DXT

$199.99 - $249.99
Monterey® 4DXT Expandable Booster Seat [Yellow Sulphur]
With 15 Improvements from previous model [Yellow Sulphur]
Featuring 4 layers of side impact protection [Yellow Sulphur]
Advance air flow with breathable side panels [Yellow Sulphur]
69% increase in seat occupancy [Yellow Sulphur]
Monterey® 4DXT high back booster [Yellow Sulphur]
Monterey® 4DXT backless booster [Yellow Sulphur]
With integrated drinks holder [Yellow Sulphur]
11 headrest positions [Yellow Sulphur]
Easy one hand width adjust [Yellow Sulphur]
Monterey® 4DXT has a fully covered back [Yellow Sulphur]
LATCH Connectors for quick and easy installation [Yellow Sulphur]
Total comfort with contoured seat base [Yellow Sulphur]
Re-modelled headrest [Yellow Sulphur]
Monterey® 4DXT Expandable Booster Seat [Black]
With 15 Improvements from previous model [Black]
Featuring 4 layers of side impact protection [Black]
Advance air flow with breathable side panels [Black]
69% increase in seat occupancy [Black]
Monterey® 4DXT high back booster [Black]
Monterey® 4DXT backless booster [Black]
With integrated drinks holder [Black]
11 headrest positions [Black]
Easy one hand width adjust [Black]
Monterey® 4DXT has a fully covered back [Black]
LATCH Connectors for quick and easy installation [Black]
Total comfort with contoured seat base [Black]
Re-modelled headrest [Black]
Monterey® 4DXT Expandable Booster Seat [Blue]
With 15 Improvements from previous model [Blue]
Featuring 4 layers of side impact protection [Blue]
Advance air flow with breathable side panels [Blue]
69% increase in seat occupancy [Blue]
Monterey® 4DXT high back booster [Blue]
Monterey® 4DXT backless booster [Blue]
With integrated drinks holder [Blue]
11 headrest positions [Blue]
Easy one hand width adjust [Blue]
Monterey® 4DXT has a fully covered back [Blue]
LATCH Connectors for quick and easy installation [Blue]
Total comfort with contoured seat base [Blue]
Re-modelled headrest [Blue]
Monterey® 4DXT Expandable Booster Seat [Gray Dark]
With 15 Improvements from previous model [Gray Dark]
Featuring 4 layers of side impact protection [Gray Dark]
Advance air flow with breathable side panels [Gray Dark]
69% increase in seat occupancy [Gray Dark]
Monterey® 4DXT high back booster [Gray Dark]
Monterey® 4DXT backless booster [Gray Dark]
With integrated drinks holder [Gray Dark]
11 headrest positions [Gray Dark]
Easy one hand width adjust [Gray Dark]
Monterey® 4DXT has a fully covered back [Gray Dark]
LATCH Connectors for quick and easy installation [Gray Dark]
Total comfort with contoured seat base [Gray Dark]
Re-modelled headrest [Gray Dark]
Monterey® 4DXT Expandable Booster Seat [Gray Light]
With 15 Improvements from Monterey® DXT [Gray Light]
Featuring 4 layers of side impact protection [Gray Light]
Advance air flow with breathable side panels [Gray Light]
69% increase in seat occupancy [Gray Light]
Monterey® 4DXT high back booster [Gray Light]
Monterey® 4DXT backless booster [Gray Light]
With integrated drinks holder [Gray Light]
11 headrest positions [Gray Light]
Easy one hand width adjust [Gray Light]
Monterey® 4DXT has a fully covered back [Gray Light]
LATCH Connectors for quick and easy installation [Gray Light]
Total comfort with contoured seat base [Gray Light]
Re-modelled headrest [Gray Light]
Monterey® 4DXT Expandable Booster Seat [Plum]
With 15 Improvements from previous model [Plum]
Featuring 4 layers of side impact protection [Plum]
Advance air flow with breathable side panels [Plum]
69% increase in seat occupancy [Plum]
Monterey® 4DXT high back booster [Plum]
Monterey® 4DXT backless booster [Plum]
With integrated drinks holder [Plum]
11 headrest positions [Plum]
Easy one hand width adjust [Plum]
Monterey® 4DXT has a fully covered back [Plum]
LATCH Connectors for quick and easy installation [Plum]
Total comfort with contoured seat base [Plum]
Re-modelled headrest [Plum]
Monterey® 4DXT Expandable Booster Seat [Red]
With 15 Improvements from previous model [Red]
Featuring 4 layers of side impact protection [Red]
Advance air flow with breathable side panels [Red]
69% increase in seat occupancy [Red]
Monterey® 4DXT high back booster [Red]
Monterey® 4DXT backless booster [Red]
With integrated drinks holder [Red]
11 headrest positions [Red]
Easy one hand width adjust [Red]
Monterey® 4DXT has a fully covered back [Red]
LATCH Connectors for quick and easy installation [Red]
Total comfort with contoured seat base [Red]
Re-modelled headrest [Red]
Monterey® 4DXT Expandable Booster Seat [Gray Dark Wool]
Monterey® 4DXT high back booster [Gray Dark Wool]
Monterey® 4DXT backless booster [Gray Dark Wool]
With integrated drinks holder [Gray Dark Wool]
Monterey® 4DXT Expandable Booster Seat [Yellow Sulphur]

The original expandable booster has evolved


$199.99 - $249.99
Klarna
or 4 interest-free payments of $50.00. Learn More
OR

Enjoy worry-free buying and perks with the Diono Difference

Recieve perks when you shop on diono.com

Additional 2-Year Warranty

Receive an additional 2-year warranty on all car seats and strollers purchased from diono.com

Free Shipping on orders over $300*

Diono proudly offers free shipping on orders over $300

Unlock exclusive offers & discounts

Unlock exclusive news, offers and discounts on all diono.com products.

1-2-1 Virtual Car Seat Fitting

Book a 1-2-1 virtual car seat fitting with a member of our car seat safety team.

* T & C's apply

Monterey® 4DXT

We’ve taken the award-winning Monterey® booster seat and painstakingly engineered 15 upgrades to create the next generation of booster. Suitable from 40 - 120 lb (18 - 54 kg) or approx. 4 – 12 years.

Features:

  • 15 UPGRADES FROM MONTEREY® XT - Includes automotive inspired fabrics that cover the entire booster seat back and breathable side panels to enhance airflow to keep your child cool on the move.
  • 4 LAYER SIDE IMPACT PROTECTION - Extra deep aluminum reinforced sides provides 4 layers of enhanced side impact protection for their head, shoulders and torso.
  • EXPANDABLE HEIGHT & WIDTH - 11 headrest positions and expandable side walls provides 69% increase in occupancy space as your child grows.
  • TWO SEATS IN ONE - Easily converts from a high back booster to a backless booster seat with wide contoured seat base and two retractable cup holders.
  • QUICK & SECURE INSTALLATION - Equipped with LATCH connectors and front adjusters to securely connect the booster seat to your vehicle in seconds, enhancing safety and stability.

Product Specs

  • Minimum User Weight: 40 lb / 18 kg
  • Maximum User Weight: 120 lb / 54 kg
  • Product Width: 24.41 in / 62 cm
  • Product Height: 28.35 in / 72 cm
  • Product Depth: 17.9 in / 45.4 cm
  • Seat Weight: 20.3 lb / 9.2 kg

Care & Maintenance

Covers: Machine wash cold, line dry. Shell and Components: Spot clean

Warranty Information

12 months standard warranty - extended to 36 months when you register with Diono® post purchase

The Diono Difference

All Diono boosters are designed and engineered to go over and above safety standards.
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.
The Diono Monterey® is the original expandable booster seat, engineered with both height and width adjustment for a custom fit at every age.
Integrated LATCH connectors and front adjusters make for a simple and safe installation every time.

Plays well with

Diono Travel Pal Back Seat Car Organizer, Perfect For Kids Toys, Books, Drinks, With Dividable Storage, Reinforced Carry Handles, Collapsible Car Storage Organizer, Folds Flat [Black]
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Travel Pal®

$18.99

The ultimate in-car organizer with 8 multi-use pockets

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