Diono Monterey 4 DXT Expandable Booster Seat

Product Code: 10831-US-01

Availability:In stock

$199.99 - $249.99

Available Options


The Diono Monterey 4DXT Booster car seat, was remodeled and improved to provide upgraded practical features. It offers a contoured structure, that will easily adjust in height and width with one hand, to sportively protect your child as they grow from 40-120 lbs. In addition, the side panels of this booster enable free air flow, and contributes 3 layers of side impact protective features, to minimize pressure of abrupt stops. With just a simple click, easily transition this booster into a backless seat with a compact structure. Two side cup compartments allow your child to have their favorite drinks within reach as they enjoy the ride.  



  • Multiple seat adjustment options with one hand.
  • Integrated latch connectors enable quick and safe installation.
  • Improved seat fabric design.
  • Breathable side panel.
  • Side impact protective features to reduce pressure of abrupt stops.
  • Easy one hand adjustment knob.
  • Approximate age 4-12 years.
  • Cup holders included.
  • Transitions into a backless seat with just a simple click.
  • Fully covered back to protect vehicle seat. 
  • Suitable Height 38"-63".
  • Suitable Weight 40-120 lbs
  • EPP foam coating / EPS coated outer frame/ Polyester & spandex seat cover.
  • Machine washable cover.

Dimensions & Weight

  • 10.6" x 20.7" x 33.9"
  • 20.3 lbs

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Order Processing & Shipping Estimates 

  • In stock items will be shipped within 2-7 business days.
  • Pre-order or special order items will have the estimated availability and/or shipping date mentioned on the product page.
  • Orders exceeding $74.99 (USD) are eligible for free shipping, all other orders will encounter a shipping fee.


Return Policy

We at Mega Babies, pride ourselves with excellent customer service. We value our customers and want them to be pleased with their purchases. If for any reason you would like to return an item, Mega Babies offers a 30 day return policy with 100% money back guarantee. 


Return Shipping Address

Mega Babies USA
Att: Shipping Department
4309 14th Ave
Brooklyn, NY 11219


How To Process a Return

  • Please contact customer service by phone 718-437-3400 or via email Sales@megababiesusa.com.
  • Allow 1-2 weeks for returns to be processed. 


Return Conditions and Clarifications

  • Return Items need to be in unused and brand new condition, include all merchandise tags, and in the original packaging.
  • Please include the order number when processing a return. 
  • Clearance and reduced items are final sale.
  • Custom and specialty orders (furniture, mattresses, etc...) are non refundable.
  • Refund payment will be credited to the card used when purchased. 
  • Customer is responsible for return shipping fee.
  • Shipping cost is non refundable.
  • Items received as a gift, can be exchanged or eligible for store credit only.


Warranty Claims

We are here to guide you with any issues you have with items under warranty that malfunction and/or have defects. Unfortunately, we are not allowed to handle the claim directly. Claims need to be filed with the company. In any event you fail to reach the company, Mega Babies will try to intervene on your behalf.

Diono Monterey 4 DXT Expandable Booster Seat