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: 606229284

Details

Brand
diono
Colour
Yellow Sulphur
Installation type
Seat Belt
Material
foam
Orientation
Forward Facing

📏11-position adjustable headrest

🥤2 retractable cup holders

🛡️2 layers side impact protection

Description

🚗 Elevate every ride with safety, comfort, and style!

GROW WITH YOU FIT - 11-position headrest and expandable backrest adjust up to 6.5 inches for a perfect, lasting fit.
SNACK SIP READY - Two built-in retractable cup holders and snack trays keep essentials close and mess-free.
ALL IN ONE BOOSTER - Supports kids from 40 to 120 lbs, eliminating the need for multiple seats as they grow.
ULTIMATE SAFETY SHIELD - Dual-layer side impact protection with aluminum-reinforced head support keeps your child secure on every ride.
COMFORT MEETS CONVENIENCE - Premium soft fabrics with layered foam padding are machine washable and designed for long journeys.

The Diono Monterey 2XT Latch 2-in-1 High Back Booster Car Seat is engineered for kids aged 4 to 12 years (40-120 lbs), featuring an 11-position adjustable headrest and expandable width for a customizable fit. It offers superior safety with dual-layer side impact protection and aluminum-reinforced head support. Lightweight and portable, it includes two retractable cup holders and premium machine-washable fabrics, making it the ultimate all-in-one booster solution for growing kids.

Specifications

ASIN	B09TTWYG3P
Age Range Description	Kid
Brand	diono
Color	Yellow Sulphur
Customer Reviews	4.5 4.5 out of 5 stars (56)
Harness Type	Seat Belt
Installation Type	Seat Belt
Item Type Name	High Back Booster
Item Weight	14.33 Pounds
Manufacturer	Diono
Manufacturer Warranty Description	12 months
Material Type	foam
Maximum Weight Recommendation	120 Pounds
Minimum Weight Recommendation	40 Pounds
Model Number	15616
Orientation	Forward Facing
Part Number	15616
Rear Facing Maximum Weight	120 Pounds
UPC	677726156160
Unit Count	1 Count

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