monterey® XT

from $169.99
buy now

select your colour



safety that grows with your child

Dependable safety for growing children, our Monterey® XT Booster is super portable, easy to store and lightweight to take with you on every adventure. Your big kid will love traveling with two swivel cup holders. Sometimes the joy of the journey has hazards along the way, that’s why we have engineered the Monterey® XT using reinforced materials and added side impact protection to provide enhanced safety as your child grows. Our designers engineered this booster to accommodate growth spurts without sacrificing on protection, with 11 headrest positions, the Monterey adjusts for a superior fit and the larger base seat supports growing legs letting your child sit back and enjoy the ride. We’ve thought of everything so you don’t have to.

why parents love me

I own the monterey XT booster by diono in black. I love that it is lightweight if we need to switch it between my husband and my vehicles. It is a great investment because it’ll carry you through as your child grows. The headrest easily moves up and down and the side panels can be expanded by quick and easy rotation on the back. We really like this booster seat and trust that it will keep our child comfortable and most of all safe.

Mom of 4

product specs

product specs





care & maintenance

cover machine washable at 86F/30C/Cold

how to install

why parents chose me

travel the world

Super portable, easy to store and light-weight – to take with you on every adventure.

grow on the go

Grows with your child! Expandable seat back (up to 20″ / 50cm), adjustable head support (11 positions), and longer seat bottom to help support growing legs.

sit back and relax

Multiple recline positions for ultra relaxation – providing optimum comfort while they are on their journey.

snack happy

Retractable cupholders – we know how to keep back seat snackers happy. this booster comes with retractable cup holder to keep drinks or snacks upright and within reach.

easy installation

Simple LATCH makes installation quick and easy, while keeping the seat secured (LATCH use optional).

perfected protection

Energy absorbing foam and reinforced aluminum sides overprotects in all the right ways.

award winning car seats

grow on the go.

buy now

parents’ choice

your choice

colours that speak all languages

what’s the difference? 

Additional 2 year warranty*

Receive an additional 2-years warranty on all car seats and strollers purchased from *T&C’s apply

FREE Shipping on orders over $400*

Diono proudly offers free shipping on orders over $400. *T&C’s apply

Join the Very Important Passenger Club

Unlock exclusive news, offers and discounts on all 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

parents love the monterey® XT!

My 5 year old son was very excited to use his new Diono car seat. He picked the color, helped his dad set it up and couldn’t wait for his first ride in it. I like the back of the car seat that gives extra protection for him. He likes the independence of being able to use the real buckle himself. The snack and cup holder are easy for him to use and we’ve wiped it down a few time to keep it looking “new” he’s very proud of his seat. My husband said it was easy to install and he liked that the seat clips into the original seat. It gives it more of secure feeling then our old flimsy booster. Thanks to the weeSpring Parent Panel for sending me this booster!

-Sam, Midvale UT

“I really like this booster seat. It’s light, very easy to use and assemble. We were able to use it in both our cars and it was not difficult to move from one to the other. It is very nicely padded and our six year old says that it is very comfy. She also loves the fact that there are two cup holders, one for a drink and the other for a snack. The only con we had with it is that because the seats in back of our SUV are a bit narrower the back piece made it too bulky to use back there. Without the back piece on it fit great, with it on not so much. Other than that the booster is great! Thanks to the weeSpring Parent Panel for sending me this booster!”


mkf1989, Lebanon PA

Please register to get your referral link.
Your Referral URL: to copy


can monterey fit 3-across?

No, it is too wide to fit 3-across because it is 19-20″ (48.3-50.8cm) wide.

how do you install the monterey XT?

There is no installation required. You may place the booster seat directly on the vehicle seat if there are no LATCH anchors. If there are LATCH anchors, the LATCH system on the booster can be used, but it is not required.

** If you are not using LATCH, the booster seat needs to be secured by the seatbelt when not occupied (this is to avoid it becoming a flying projectile if in a collision).

what is the difference between monterey XT and cambria?

The Monterey XT comes with an 11 position headrest, expandable seat back, aluminum alloy reinforced sides lined with EPS foam for side impact protection, and a stronger seat back designed for added strength. The Cambria comes with a 6 position headrest and is lined with EPE foam for side impact protection. Both easily convert to a backless booster.

is there a top tether?

No, there is no top tether and they are not required.