---
product_id: 369729417
title: "Diono Monterey 5iST FixSafe High Back Booster Car Seat with Expandable Height and Width, Compact Fold to Full Size Booster, Foldable, Portable Booster for Go-Anywhere Travel, Yellow Mineral"
brand: "diono"
price: "570.62 DT"
currency: TND
in_stock: false
reviews_count: 1
url: https://www.desertcart.tn/products/369729417-diono-monterey-5ist-fixsafe-high-back-booster-car-seat-expandable
store_origin: TN
region: Tunisia
---

# Folds to carry-on size for portability 12-position adjustable headrest & backrest 8 layers side impact protection Diono Monterey 5iST FixSafe High Back Booster Car Seat with Expandable Height and Width, Compact Fold to Full Size Booster, Foldable, Portable Booster for Go-Anywhere Travel, Yellow Mineral

**Brand:** diono
**Price:** 570.62 DT
**Availability:** ❌ Out of Stock

## Summary

> 🚗 Fold, Fit, and Fly: The Booster That Moves as Fast as Your Life

## Quick Answers

- **What is this?** Diono Monterey 5iST FixSafe High Back Booster Car Seat with Expandable Height and Width, Compact Fold to Full Size Booster, Foldable, Portable Booster for Go-Anywhere Travel, Yellow Mineral by diono
- **How much does it cost?** 570.62 DT with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/369729417-diono-monterey-5ist-fixsafe-high-back-booster-car-seat-expandable)

## Best For

- diono enthusiasts

## Why This Product

- Trusted diono brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Grow-With-You Comfort:** 12-position SafePlus headrest and backrest expand up to 85% in width and height for a perfect fit from 40 to 120 lbs.
- • **Ultimate Safety Shield:** Engineered with 8 layers of high-impact aluminum and EPS foam for industry-leading side impact protection.
- • **Kid-Friendly Convenience:** Built-in removable cup holder and contoured premium soft fabrics with machine-washable covers keep every ride comfortable and mess-free.
- • **Travel-Ready Portability:** Compact fold design shrinks to 25% smaller than average boosters with integrated carry handle and straps for effortless on-the-go use.
- • **Quick & Secure Installation:** SafePlus rigid LATCH connectors and one-hand adjustments make setup and transfers between vehicles a breeze in under 2 minutes.

## Overview

The Diono Monterey 5iST FixSafe is a high-back booster seat designed for children weighing 40 to 120 lbs and up to 63 inches tall. It features a 12-position adjustable headrest and backrest that expand up to 85% in size, ensuring a custom fit as your child grows. Safety is paramount with 8 layers of side impact protection including reinforced aluminum and energy-absorbing foam. Its innovative foldable design reduces the seat to carry-on size with integrated handles and straps, making it perfect for travel and easy vehicle transfers. Installation is quick and secure with SafePlus rigid LATCH connectors, and comfort is enhanced by deep padding, breathable fabrics, and a removable cup holder. Machine-washable covers add practical convenience for busy families.

## Description

Introducing the next generation of expandable booster. Designed for ultimate portability, Monterey 5iST FixSafe transforms in seconds from a compact fold to a full-size booster seat, without compromising safety or comfort. At 25% smaller than the average booster, Monterey 5iST FixSafe folds down into a compact and convenient size and features an integrated carry handle and carry straps with designated storage compartment. So, whether youre on the daily commute, carpooling, storing in the garage or jumping in a cab, with Monterey 5 you can always take safety with you for the joy of the journey. Suitable from 40 - 120 lb Monterey 5iST FixSafe expands in height and width to provide up to 85% more room as they grow up to 63 tall. Featuring 12 headrest positions and expands up to 20 in width, Monterey 5iST FixSafe can adapt quickly to growing children, with plenty of room for shoulders, hips and legs. All of these great features have been combined with SafePlus engineering, with the Monterey 5iST FixSafe subjected to a combination of the most rigorous crash tests; front, rear, and side impacts, and rollover test to ensure the safest seat possible. The advanced SafePlus side impact protection features 8 layers of interlocking EPS and EPP foam and includes the SafePlus energy absorbing shell, to shield and protect with SafePlus airflow technology built in for optimum child comfort. The open design features easy to use SafePlus secure belt guides to eliminate misuse and SafePlus secure belt lock to ensure the adult seatbelt is always routed correctly. The seat base is contoured for child comfort and includes a cup holder for road trip drinks and snacks. Designed with a simple 4 step installation and adjustable rigid latch FixSafe connectors, Monterey 5iST FixSafe can be used straight out of the box, with no assembly required. When youre on the move or need to switch between vehicles, the FixSafe connectors offer a simple way to secure the booster to the vehicle latch system, for a safe and convenient installation every time.

## Features

- 8 Years One Booster - for your big kid from 40 - 120 lb. It's all you will ever need.
- One-hand easy-adjust - SafePlus 12-position headrest and backrest that grows up with your child. Engineered for safety and comfort with 8 layers of Side Impact Protection.
- Built for comfort for every size - our backrest has deep padded cushioning.
- One built-in removable cup holder - keeps your big kid's drink close at hand.
- Our contoured premium soft fabrics - with layered foam padding that provide comfort and support can be easily removed for machine washing.
- SafePlus belt guides - easy access to seatbelt buckle help your big kid with self buckling -- don't forget to check though!
- Unbox, unfold, install, adjust and go - all in 2 minutes or less. Thanks to the SafePlus rigid LATCH connectors, all at a push of a button. Easy to move between cars, or to store at a push of the quick release latch button.
- Engineered with our most side impact protection - our rigid shell is reinforced with 8 layers of high-impact aluminum and EPS energy absorbing foam, to protect the head, shoulders, and torso.
- Folds to the size of a carry-on bag simple storage options for on-the-go travel or small spaces.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Product Dimensions | 15 x 17 x 24.8 inches |
| Item model number | 15705 |
| Is Discontinued By Manufacturer | No |
| Minimum weight recommendation | 40 Pounds |
| Maximum weight recommendation | 120 Pounds |
| Minimum height recommendation | 38.2 Inches |
| Maximum height recommendation | 63 Inches |
| Material Type | Alloy Steel, Plastic, Polypropylene, Polystyrene |
| Material Composition | 100% Polyester |
| Care instructions | Covers: Machine wash cold, line dry. Shell and Components: Spot clean |
| Additional product features | Transforms in seconds from a compact fold to a full-size booster seat, without compromising safety or comfort |
| Number of reclining positions | 12 |
| Batteries required | No |
| Orientation | Forward Facing |
| Forward-facing minimum child weight | 40 Pounds |
| Forward-facing maximum child weight | 120 Pounds |
| Harness type | Seat Belt |
| Is portable | Yes |
| Item Weight | 18.74 pounds |

## Product Details

- **Brand:** Diono
- **Installation Type:** Seat Belt
- **Material:** Alloy Steel, Plastic, Polypropylene, Polystyrene
- **Color:** Yellow Mineral
- **Orientation:** Forward Facing

## Images

![Diono Monterey 5iST FixSafe High Back Booster Car Seat with Expandable Height and Width, Compact Fold to Full Size Booster, Foldable, Portable Booster for Go-Anywhere Travel, Yellow Mineral - Image 1](https://m.media-amazon.com/images/I/61SX9zmbSXL.jpg)
![Diono Monterey 5iST FixSafe High Back Booster Car Seat with Expandable Height and Width, Compact Fold to Full Size Booster, Foldable, Portable Booster for Go-Anywhere Travel, Yellow Mineral - Image 2](https://m.media-amazon.com/images/I/71bOfQex9fL.jpg)
![Diono Monterey 5iST FixSafe High Back Booster Car Seat with Expandable Height and Width, Compact Fold to Full Size Booster, Foldable, Portable Booster for Go-Anywhere Travel, Yellow Mineral - Image 3](https://m.media-amazon.com/images/I/61MXBCV352L.jpg)
![Diono Monterey 5iST FixSafe High Back Booster Car Seat with Expandable Height and Width, Compact Fold to Full Size Booster, Foldable, Portable Booster for Go-Anywhere Travel, Yellow Mineral - Image 4](https://m.media-amazon.com/images/I/71oh+qj+38L.jpg)
![Diono Monterey 5iST FixSafe High Back Booster Car Seat with Expandable Height and Width, Compact Fold to Full Size Booster, Foldable, Portable Booster for Go-Anywhere Travel, Yellow Mineral - Image 5](https://m.media-amazon.com/images/I/71uyTVmEj5L.jpg)

## Questions & Answers

**Q: can  this be used by a young adult with autism and sensory issues  ......?**
A: This is expandable to grow with your child up to 120 lbs. or 63” tall

**Q: Will this booster work in the center seat?**
A: Hello, thanks for the question. It cannot be installed with a lap belt only. If your center seat just has that, you won't be able to. But if there's a shoulder and lap belt, you'll be able to.

**Q: Does this seat also have a tether top anchor?**
A: There's no top tether for this seat.

**Q: What is the depth of the seat when installed? How much room does the child have on the seat when they are sitting?**
A: The front of the seatback to the front of the seat base is approximately 13.5”!

## Customer Reviews

### ⭐ Not for tall, slim kids.
*by M***M on January 12, 2024*

The concept is good, and I love the travel/foldability of it. Unfortunately it takes design cues from general clothing sizes of small, medium and large - meaning if a child had a tiny waist, he/she must be short. Or, if tall, they must be extremely wide. The height and width expansion cannot be adjusted separately. There’s no option for *just* raising the height. To accommodate a child 48” tall the kid probably needs to be 60+ pounds. My high school son, obviously too old for a booster, is 5’6” & 116lbs of muscle didn’t even come close to needing the seat expansion at the highest headrest setting. The idea is ok, but clearly designed for todays *ahem* “larger” children, not super slim or even low-average BMI kids. FWIW, I’m 5’7” and 140. I fit in the seat width wise. How is it supposed to fit my 1st grader who is 100lbs lighter than me?!?My kid is thin, 48” and 40.5 pounds soaking wet. She *barely* meets the regulation weight for a booster but since our car got the best safety rating I relented & said she can use a high back booster in that car. I regret it. Returning it. I need a thin, slim seat to fit in a model 3; one safe enough for local streets (under 45mph/to - from school) - this was almost perfect but not quite.

## Frequently Bought Together

- Diono Monterey 5iST FixSafe High Back Booster Car Seat with Expandable Height and Width, Compact Fold to Full Size Booster, Foldable, Portable Booster for Go-Anywhere Travel, Yellow Mineral
- Diono Ultra Mat Complete Back Seat Upholstery Protection from Child Car Seats and Pets, Crash Tested, Premium Ultra Thick Padding, Durable, Water Resistant, Anti-Slip, 3 Mesh Storage Pockets
- Diono Radian 3R, 3-in-1 Convertible Car Seat, Rear Facing & Forward Facing, 10 Years 1 Car Seat, Slim Fit 3 Across, Jet Black

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-08-30*