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Diono Monterey® 4DXT - High Back Car Booster Seat with Latch Connectors

by Diono®

Original price $299.99
Original price $249.99 - Original price $359.99
Original price $299.99
Current price $224.99
$224.99 - $359.99
Current price $224.99
Color: Black
Manufacture SKU: 10830
SKU 210000004588

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.


  • 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 2 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.

CANADA: Shipping to Quebec and Ontario takes 1 to 2 business days. Shipping to the rest of Canada takes between 1 to 7 business days, relative to your distance from Montreal. Free shipping over 50$*. Exceptions apply to large items like cribs, mattresses and daycare furniture.

USA: Shipping to United States takes 2 to 7 business days, relative to your distance from Montreal. Free shipping over 100$* Exceptions apply to large items like cribs, mattresses and daycare furniture.

INTERNATIONAL: International shipments take 3 to 10 business days.

If a product arrives defected or not as described, we will replace it at no extra cost to you.

Returns or exchange for sizing will be at no extra cost to the buyer.

If the return or exchange is for any other reason, we will ask the buyer to pay for the return shipping.

For more information, see our return policy.

Every product comes with it's own warranty. Once a product is removed from its original packaging, the buyer must contact the manufacturer directly to make a warranty claim. All our suppliers are reputable Canadian brands with good warranty policies.

Warranty's do not apply for clothing and shoes.

Manufacture SKU: 10830

Customer Reviews

Based on 11 reviews
review f.d.
Great seat

Great seat

review f.d.
Love the yellow color but shocked that the cup holders are too narrow!

Just received and installed our Monterey 4 DXT in Yellow Sulphur. The color is bright and vibrant which made my kid happy. It took only a few minutes to read the instructions and install the seat via Latch.

Hopefully we will never have to experience how safe they say this seat is. So I can't speak to that for now.

So far, the oRead more about review stating Love the yellow color but shocked that the cup holders are too narrow!nly downside we've discovered is that the seat is wider than expected. My 6yo has a hard time reaching around the wings to the seat belt insert which is flush up against the side at the back of the seat bottom in our VW wagon. The width of the seat nearly covers the seat belt insert.

The cup holders that pull out are also too wide and we can't pull the holder out on the door side. In fact the cup holders are too small and do not fit our Hydroflask or Kleen Kanteen bottles! Forget about the bottles with the extra silicon base. This was shocking since most stainless steel bottles on the market are near identical in diameter. Furthermore, we can't use the cup holder in our car's center fold-down armrest either because then my kid can't unbuckle their seat belt. The Diono seat is just too wide and doesn't leave a gap.

Overall it seems like this car seat will do better in bigger car. And Diono should consider increasing the diameter of the cup holders at least a 1/8" to accommodate standard little & big kid sized bottles (vs. smaller toddler bottles.) I'm about to write to them about this - it's a big issue for pretty standard equipment on car seats. And this model is brand new so it's not like water bottles have changed in the last few months. Truly surprised by this oversight.

review f.d.
wide seat capacity at an age appropriate buckling ability.

Lots of room for a growing 5yo boy who wears size 7-8 clothes.

review f.d.
Only car seat brand I’ll ever buy

I love our Diono seats. We’ve had multiple styles since my oldest was out of a carrier. They are comfortable, easy to clean and most importantly SAFE. This will likely be the last seat we ever need (youngest is 6, 56lbs) and while that is kind of sad I’m glad that we found this brand so long ago.
My youngest picked the color herself -vibrant bRead more about review stating Only car seat brand I’ll ever buylue-and it’s very comfortable. She can easily buckle herself and the belt remains in place and doesn’t bunch up-like our previous 5pt turned booster (also Diono).
My oldest also has this seat in purple/pink (9yo and 65, tall for her age but we still use the back for maximum safety). We have had her seat for over a year and it has held up very well for daily trips to school and multiple days of use per week.
This is the perfect booster combo.

2018 Honda Pilot with captain chairs

review f.d.
Saved my kids lives

We were just in a very serious car accident & my kids both had these seats. VERY SAFE! We all walked away unharmed. My kids were so safe in these Diono seats. Just bought 2 more replacements.


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