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Monterey® 2XT


2-in-1 Booster

The original 2-in-1 booster that grows with your big kid


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Monterey® 2XT

The original 2-in-1 booster seat with one of a kind, easy-adjust, separate height and width expansion. Transforms from a high-back booster to a backless booster as your big kid grows.


  • 8 Years One Booster - for your big kid from 18 - 54 kg. It's all you will ever need.
  • Easy-adjust - 11-position headrest that grows up with your child. Engineered for safety and comfort with 2 layers of Side Impact Protection.
  • One of a kind - easy-adjust expandable backrest allows up to 16.5 cm to grow with your big kid. With 2 layers of Side Impact Protection and deep padded cushioning.
  • Two built-in retractable 2-in-1 cup holder and snack tray - keeps your big kid's drink close at hand and stows away their essentials.
  • Our contoured premium soft fabrics - with layered foam padding that provide comfort and support can be easily removed for machine washing.
  • SafePlus® belt guides - easy access to seatbelt buckle help your big kid with self buckling - don't forget to check though!
  • Easy, quick and secure installation - engineered with automotive steel LATCH connectors and 2 easy adjust LATCH straps allow you to quickly tighten and secure your booster to your vehicle.
  • Engineered with side impact protection - our rigid shell is reinforced with 2 layers of high-impact aluminum and EPS energy absorbing foam,to protect the head, shoulders, and torso.

Product Specs

  • Minimum User Weight: 18 kg / 40 lb
  • Maximum User Weight: 54 kg / 120 lb
  • Maximum User Height: 160 cm / 63 in
  • Product Height: 69 cm / 27.2 cm
  • Product Width: 55.9 cm / 22 in
  • Product Depth: 44.5 cm / 17.5 in
  • Seat Weight: 6.5 kg / 14.3 lb
  • Number of Head Support Positions: 11

Care & Maintenance

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

Warranty Information

12 months standard warranty

Monterey® 2XT Booster, Instruction Manual, Cup Holder

Diono booster seats can be used for children weighing 40-120 lbs. (18-54 kg) and are 38-63 in. (96.5-160 cm) tall. Typically once a child reaches 5 years of age they are mature enough to ride in a booster seat.

Diono high back boosters with a detachable back are the Monterey® 4DXT, Monterey® 2XT, Cambria® 2. All come with a detachable back to convert into a backless booster seat.

Our booster seats fit 2 across in most cars. Each vehicle model is different and allows for various seating positions. Consumers should consult vehicle owners manual for appropriate car seat placement in their car that may fit more than 2 across.

Solana® has fabric cup holders. Solana® 2, Everett NXT, Cambria® 2, Monterey® XT, Monterey® 2XT, and Monterey® 4DXT have two retractable cup holders. Monterey® 5iST FixSafe® have a snap-in Monterey® cupholder.

The Monterey® 2XT Latch is recommended to be installed with the lower anchors if you vehicle is equipped with them. However, it can be used without.

Diono booster seats are not meant to be used on airplane. Boosters require a lap/shoulder belt and airplanes only have a lap belt.

All Diono booster seats have a life span of 8 years, starting from the date you purchase your seat. In the event the date of purchase cannot be determined then we use the date of manufacture.