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monterey® XT


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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


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I own the monterey XT booster by diono in heather grey. 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″), adjustable head support (11 positions), and longer seat bottom to help support growing legs.

sit back and relax

The Monterey XT backrest reclines to adjust to your vehicle seat, creating the most comfortable seating position for your child.

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.

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your choice

colors that speak all languages

parents’ choice

parents love the monterey® XT!

I received this seat as part of the wee spring parent panel. We were using a competitors booster seat for our 6 year old daughter but after switching to the diono Monterey xt booster seat she loves it and doesn’t want the other one anymore. We had to install the seat directly behind the passenger seat because when we tried in the middle of the seat the seat belts prevented the seat being flush with the back of the seat. The latch system is built directly into the seat making the latch process very easy. The width adjustment is very nice too and easy to use for bigger children. My little girl is very happy with this seat and so am I.

-Mommy23, Virginia Beach VA

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

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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.

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.