2-in-1 booster
Diono Monterey 2XT 2-in-1 High-Back Booster
| Mode | Weight | Height |
|---|---|---|
| High-back booster | 40–120 lb | 38–63 in |
| Backless booster | 40–120 lb | 38–63 in |
- Seat weight
- Not published
- Width
- Not published
- Usable life
- 8 years
- Aircraft
- Not certified
Diono does not sell this seat on Amazon. See its own site for photos.
Diono Monterey 4DXT 2-in-1 High-Back Booster
A 2-in-1 booster seat with 2 modes: high-back booster 40 to 120 lb, 38 to 63 in; backless booster 40 to 120 lb, 38 to 63 in.
At a glance
- Fits children from 40 to 120 lb
- Up to 63 in tall
- 2 modes: high-back booster, backless booster
- 8-year usable life
Not sold on Amazon
Diono lists this seat on its US site. Buy from Diono or an authorized retailer, and confirm the exact model number before you buy.
Who is the Monterey 4DXT 2-in-1 High-Back Booster for?
The Diono Monterey 4DXT is a 2-in-1 booster used as a high-back or backless booster for children 40 to 120 lb and 38 to 63 in. Its manual describes a backrest width adjuster, head support height adjuster, two-stage recline and LATCH/UAS connectors. It expires eight years from the date of purchase.
Reasons to consider it
- High-back and backless modes, both rated for 40 to 120 lb and 38 to 63 in
- A backrest width adjuster handle on the back of the seat
- A two-stage recline to match the vehicle seat
- LATCH/UAS connectors, which Diono recommends whenever the vehicle has lower anchors
Things to weigh up
- Diono's manual does not publish the seat's width range, depth or weight
- The head support should not be removed once inserted
- The manual does not explain how it differs from the Monterey 2XT
- Not certified for use in aircraft
My take on the Monterey 4DXT 2-in-1 High-Back Booster
It suits a family that wants a high-back booster that widens and reclines, attaches with lower anchor connectors, and later converts to backless. The trade-off is that the manual publishes no width range or seat weight. Its manual repeats the Monterey 2XT instructions almost word for word, so the published documents do not show what separates the two.
A research summary of Diono’s published specifications and manual, read . Not a hands-on test or a crash-safety rating.
Who the Monterey 4DXT 2-in-1 High-Back Booster fits
This seat covers 2 stages, and a child has to meet every limit of the stage they are in. Diono gives it a 8-year life from the date of manufacture, so check the date label before using a hand-me-down.
- High-back booster40 to 120 lb · 38 to 63 in
- The seat’s own back and belt guide route the vehicle belt across the shoulder, and the sides give the child something to lean on when they sleep.
- Backless booster40 to 120 lb · 38 to 63 in
- Only the base is left, so the vehicle seat has to support the child’s back and head, and the belt guide sits at the hip.
What are the Monterey 4DXT 2-in-1 High-Back Booster weight, height and age limits?
| Mode | Child weight | Child height | Minimum age | Conditions |
|---|---|---|---|---|
| High-back booster | 40 to 120 lb | 38 to 63 in | Not published | — |
| Backless booster | 40 to 120 lb | 38 to 63 in | Not published | Child's ears must be below the top of the fully raised vehicle seat or headrest |
A child must meet every limit for the mode they use. The labels on your seat and its manual are the final word.
Monterey 4DXT 2-in-1 High-Back Booster specifications
- Seat weight
- Not published
- Width
- Not published
- Usable life
- 8 years
- Aircraft use
- Not certified for aircraft
How the Monterey 4DXT 2-in-1 High-Back Booster installs
- Lower anchors
- LATCH/UAS connectors. Check your vehicle manual for which seating positions have anchors, and switch to the seat belt once the child passes the anchor weight limit in the manual.
Every install is a fit between one seat and one vehicle. Read both manuals, and use a free inspection station if anything is unclear.
Will it fit your car?
Diono does not publish a width for this seat, so measure your back seat and compare it with the seat in a store before buying.
- Check your vehicle manual for lower anchor positions and any head-restraint rules.
- Rear-facing seats need front-seat room: try the install behind the driver before you commit.
- Not certified for aircraft use: plan on gate-checking it or using a different seat to fly.
What features does the Monterey 4DXT 2-in-1 High-Back Booster have?
- LATCH/UAS connectors
What to know before you live with it
Setup and LATCH/UAS
The manual warns not to use the booster unless it is completely assembled. The head support goes into the seat back while you press the adjuster upward, and once inserted it should not be removed. The backrest hooks onto the seat bottom mounting points. To attach to the car, lay the booster on its side, press the cam lock lever, extend the LATCH/UAS straps, clip them to the lower anchors and tighten them one at a time. The whole seat bottom should sit flat, and the head support must rest against the vehicle seat back or head support.
Source: Diono Monterey 4DXT manual (PDF)
Fitting the belt
Turn the backrest width adjuster handle on the back of the backrest to fit the child, then set the head support so the shoulder belt guide is slightly above the shoulders, at least 1 cm. Route the shoulder belt through the shoulder belt guide and the lap belt through both lap belt guides, low on the hips. The shoulder belt must not touch the neck or sit over the armrest. Pull webbing out of the retractor and let it feed back before each use, and never lock the retractor.
Source: Diono Monterey 4DXT manual (PDF)
Backless mode and cleaning
For backless use, remove the backrest and check the LATCH/UAS connectors are secure. The child's ears must be below the top of the vehicle seat or headrest, and if the shoulder belt does not fit correctly the stored shoulder belt guide strap must be used, with the RED guide just above the shoulder. For cleaning, detach the backrest, raise the headrest to remove its cover, undo the hook and loop strip on the seat bottom to free the backrest cover, release the seat bottom cover's elastic tabs, then machine wash separately in cold water on a gentle cycle with mild detergent, or hand wash, and dry flat away from sunlight.
Source: Diono Monterey 4DXT manual (PDF)
Is the Monterey 4DXT 2-in-1 High-Back Booster recalled?
No campaign in the current NHTSA child-restraint data names this model family, and I have not run a separate review for it. Check your seat’s model number and date of manufacture before use.
Monterey 4DXT 2-in-1 High-Back Booster: common questions
What are the Monterey 4DXT weight and height limits?
The manual says 40 to 120 lb (18 to 54 kg) and 38 to 63 in (97 to 160 cm) in both high-back and backless mode.
How is the Monterey 4DXT different from the Monterey 2XT?
The Monterey 2XT manual gives the same 40 to 120 lb and 38 to 63 in limits and the same width adjuster and recline steps. Diono's manuals do not state a difference, so I would compare the current listings.
Does the Monterey 4DXT recline?
Yes. The manual describes a two-stage recline to match the vehicle seat. A gap behind it is acceptable as long as the head support touches the vehicle seat back or headrest.
When does the Monterey 4DXT expire?
The manual says it is expired over eight years from the date of purchase.
Is the Monterey 4DXT approved for aircraft?
No. The manual states it is not certified for use in aircraft because aircraft seats do not have shoulder belts.
Answers refer to the model and manual version on this page. Check the instructions supplied with your seat.
Before you buy
- Weigh and measure your child. The limits above are the manufacturer’s, and a child has to meet all of them for the mode they will use.
- Confirm the exact version. Colors, retail exclusives and model numbers change limits more often than you would expect.
- Read the manual before you buy, not after. It is linked above and holds the fit rules, the install methods and the expiry.
- Check recalls by model number and date of manufacture, and register the seat with Diono so you hear about the next one.
Sources
Other Diono booster seats
| Model | Top child weight | Seat weight | Width | Usable life |
|---|---|---|---|---|
| Monterey 4DXT 2-in-1 High-Back Booster (this seat) | 120 lb | — | — | 8 years |
| Connect3 R 2-in-1 High-Back Booster | 120 lb | — | — | 8 years |
| Connect3 R Backless Booster | 120 lb | — | — | 8 years |
| Connect3 RXT 2-in-1 High-Back Booster | 120 lb | — | — | 8 years |
| Connect3 RXT Backless Booster | 120 lb | — | — | 8 years |
| Cambria 2 2-in-1 High-Back Booster | 120 lb | — | — | 8 years |
| Cambria 2XT 2-in-1 High-Back Booster | 120 lb | — | — | 8 years |
| Everett NXT High-Back Booster | 120 lb | — | — | 8 years |
| Monterey 2XT 2-in-1 High-Back Booster | 120 lb | — | — | 8 years |
| Monterey 5iST FixSafe High-Back Booster | 120 lb | — | — | 8 years |
| Monterey 6XT SafePlus High-Back Booster | 120 lb | — | — | 8 years |
| Monterey 6DXT SafePlus High-Back Booster | 120 lb | — | — | 8 years |
| Solana Backless Booster | 120 lb | — | — | 8 years |
| Solana 2 Backless Booster | 120 lb | — | — | 8 years |