Diono
COMING SOON! Monterey® 5iST FixSafe® Booster
COMING SOON! Designed for ultimate portability, the Monterey® 5iST FixSafe™ transforms in seconds from a compact fold to a full-size booster seat, without compromising safety or comfort. Suitable from 40 – 120 lbs and up to 63″ tall. COMING SOON!
- Expands in height and width to provide 85% more occupancy
- Compact fold with built-in carry straps
- 8 Layers of Safe+ Side Impact Protection
- 12-position headrest
- Safe+ Energy Absorbing Shell
- Safe+ Secure Belt Lock and Belt Guides
- FixSafe Rigid LATCH Connectors
- Designated Storage Compartment
- Removable Cup Holder
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SafePlus™ Engineering
Featuring SafePlus™ engineering, the Monterey® 5iST FixSafe™ has been subjected to rigorous crash testing to create the most advanced Monterey® ever.

Room To Grow
Featuring 12 headrest positions and expands up to 20” in width, the Monterey® 5iST FixSafe™ provides to 85% more room and can accomodate children up to 63” tall.

Travel Friendly
At 25% smaller than the average booster, the Monterey® 5iST FixSafe™ folds down into a compact and convenient size. The integrated carry handle and straps also make it ideal for travel and provides 3 ways to carry.

Machine Washable
The Monterey® 5iST FixSafe™ is machine washable and features easy remove covers.
Product Specs
Available Colors | Black Jet, Blue Sky, Gray Slate, Purple Plum, Red Cherry, Yellow Mineral |
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Product Weight | 18.7 lbs. |
Product Dimensions | 15 x 17 x 24.8 inches |

Additional Info
Dimensions (Folded) | 7.5 x 17.9 x 23.4 inches |
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Minimum User Weight | 40 lbs |
Maximum User Weight | 120 lbs |
Maximum User Height | 63 inches |
Head Support Positions | 12 |
Cup Holder | Yes |
Use and Care | Covers: Machine wash cold and line dry. Shell and Components: Spot clean |
Warranty | 12 months standard warranty - extended to 36 months when you register with Diono® post purchase |
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What comes in the box?
Monterey® 5iST FixSafe™ Booster, Instruction Manual, Cup Holder, Carry Strap x2
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When is my child ready for a booster seat?
Diono booster seats can be used for children weighing 40-120 lbs. and are 38-63 in. tall. Typically once a child reaches 5 years of age they are mature enough to ride in a booster seat.
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Will the booster seat fit 3 across in my car?
Our booster seats fit 2 across in most cars. Each vehicle model is different and allows for various seating positions. Consumers should consult vehicle owners manual for appropriate car seat placement in their car that may fit more than 2 across.
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How do I install the Monterey® 5iST FixSafe™ with rigid LATCH?
Press the LATCH release button on the front of the booster. Attach the LATCH connectors to the vehicle’s lower anchors. Confirm the connector’s lock indicator changes from red to green. Push the seat backward until it touches the vehicle seat back.
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How do I uninstall the Monterey® 5iST FixSafe™ with rigid LATCH?
Press the LATCH release button located on the front of the car seat and pull the car seat away from the vehicle backseat.
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Can I use the Monterey® 5iST FixSafe™ if I don't have a LATCH system?
Yes, it can be used without the LATCH. They will need to use the shoulder seat belt to hold the seat in place when not in use to prevent it from becoming a flying object during a crash or sudden stop.
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How do I make it into a backpack with the strap?
Locate the straps included with the car seat accessories. Attach the straps to the fabric loops on the back of the seat. Next adjust the straps for comfort before use.
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When does my booster seat expire?
All Diono booster seats have a life span of 8 years, starting from the date you purchase your seat. In the event the date of purchase cannot be determined then we use the date of manufacture.