How wide is the seat between the arm rests? My child has wide hips and I want to make sure he fits.

14” near the back and it opens to 15” near where the hands rest. My 5yo wears a boys size 10 or Medium and he’s comfortable in the seat.

What’s the narrowest it will go?

Can you be a little more specific? The adjustable sides expand from approximately 18" - 22" in the shoulder width. The bottom portion measures 15" in the back. Hope this answers your question.

Would this fit to my 3 years old one? He’s about 40 lbs

No. A 40 lb 3 year old should be rear facing in a convertible 5 point harness (even if their feet touches the seat) as its 5 times safer. I would look at the Diono Radian. Boosters start around 6 for average size kids or maybe 5 for a very large child. If rear facing is not possible he should be forward facing in a 5 point harness.

Does this seat have a tether to attach to car?

Yes, it has the Latch System. You see the 2 straps sticking out of the front? Those are to tighten the straps(tether). There are 2 hooks that can attach to something from the base. I don't have the Latch System in my truck, but I was able to fastened the hooks to the frame. They say they aren't necessary, but they keep the seat in place. The best way to see this, is to go on youtube and search the seat. There is a good video on there to show how to install. I think there is one on their website too. The pictures and descriptions on Amazon aren't always sufficient.

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Diono Monterey 2XT Latch 2 in 1 High Back Booster Car Seat with Expandable Height & Width, Side Impact Protection, 8 Years 1 Booster, Yellow Sulphur

Product ID: 681382251

Details

Brand
Diono
Colour
Yellow Sulphur
Harness type
Seat Belt
Installation type
Seat Belt
Item weight
14.33 Pounds
Material
Aluminium

☕2 retractable cup holders

📏11-position adjustable headrest

🛡️2-layer side impact protection

Description

🚗 Elevate every journey with safety, style, and smart growth!

UNMATCHED SAFETY - Dual-layer aluminum-reinforced side impact protection shields head, shoulders, and torso.
SNACK SIP READY - Two built-in retractable cup holders keep essentials close and mess-free on every ride.
GROW WITH YOU COMFORT - 11-position headrest and expandable width ensure a perfect fit from toddler to big kid.
EFFORTLESS CONVENIENCE - Quick-install LATCH system and easy-access belt guides for stress-free setup and self-buckling.
MACHINE WASHABLE LUXURY - Premium contoured fabrics with layered foam padding are removable and machine washable for easy upkeep.

The Diono Monterey 2XT Latch 2-in-1 High Back Booster is engineered for kids aged 4-12 years (18-54 kg), featuring an 11-position adjustable headrest and expandable width for a custom fit. It boasts dual-layer side impact protection with aluminum reinforcement and EPS foam for superior safety. Designed for convenience, it includes quick-install LATCH connectors, easy-access belt guides, and two retractable cup holders. Premium machine-washable fabrics and deep padding ensure comfort on every ride.

Specifications

ASIN	B09TTWYG3P
Age Range Description	Kid
Brand Name	Diono
Colour	Yellow Sulphur
Customer Reviews	4.5 4.5 out of 5 stars (56)
Forward Facing Maximum Weight	54 Kilograms
Forward Facing Minimum Weight	18 Kilograms
Harness Type	Seat Belt
Included Components	Monterey 2XT expandable booster seat and instruction manual.
Installation Type	Seat Belt
Item Dimensions D x W x H	44.5D x 55.9W x 69H centimetres
Item Type Name	High Back Booster
Item Weight	14.33 Pounds
Manufacturer	Diono
Manufacturer Part Number	15616
Material Type	Aluminium
Maximum Height Recommendation	160 Centimetres
Maximum Weight Recommendation	120 Pounds
Minimum Height Recommendation	97 Centimeters
Minimum Weight Recommendation	18.14 kg
Model Number	15616
Number of Height Positions	11
Orientation	Forward Facing
Rear Facing Maximum Weight	120 Pounds
UPC	677726156160
Unit Count	1 Count

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