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Monterey® 5iST FixSafe™

Monterey® 5iST FixSafe™

Welcome To Travel Reinvented

Family Travel is Changing

Our team asked, how do we simplify travel, so parents and children can take safety with them wherever they go?

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.

Take Safety With You

Transforms in seconds from a compact fold to a full-size booster, without compromising comfort or safety.

Diono won prestigious iF DESIGN AWARDS in product design for the Monterey® 5iST FixSafe™ chosen by the 98-member jury, made up of independent experts from all over the world in 2021 and 2022.

Honouring the first collaboration between Diono and Berlin based design studio, WhiteID, Monterey® 5iST FixSafe™ combined our signature world-class American engineering with forward-thinking, edgy European design to create the next generation of child car seat. Monterey® 5iST FixSafe™ continued to turn heads across Europe, catching the attention of industry experts and innovators of the technology of tomorrow. 

This time, Design Center for the Baden-Württemberg International Design Award Focus Open awarded Monterey® 5iST FixSafe™ winner of the Gold Focus Open 2021. 

Here in the US, definitive voice for millennial parents, The Bump, announced the winners of its ninth annual The Bump Best of Baby Awards, honoring the most outstanding baby and new parent products for 2021. 

In 2022 Diono won a prestigious Red Dot Design Award and most recent winners of the National Parenting Product Awards 2022.


Expands in height and width

One-hand automatic height and width adjustment provides 85% more room as your child grows.


Compact fold to full size booster in seconds

25% smaller than the average booster seat without compromising safety or comfort.


FixSafe™ rigid latch connectors

Easy install with FixSafe™ rigid latch connectors for a safe and secure installation every time.


Safe+® Engineering

Includes 8 layers Safe+® side impact protection and rigorous crash testing to create the most advanced Monterey® ever.

The Most Advanced Monterey Ever

Monterey® 5iST FixSafe™

High back booster car seat designed for ultimate portability.

WAS $269.99

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Meet The Monterey® Family

Monterey® 5iST FixSafe™

Designed for ultimate portability and is 25% smaller than the average booster seat. 

  • MSRP - $269.99
  • Expands in height and width
  • Compact fold to full size booster in seconds
  • Fixsafe™ rigid latch connectors
  • 8 years one booster
  • Safe+® Engineering
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Monterey® 4DXT

Features 15 upgrades from Monterey® XT including new automotive-inspired fabrics.

  • MSRP - $199.99
  • 15 upgrades from Monterey® XT
  • 4 layer side impact protection
  • Expandable height & width
  • Two seats in one
  • Quick & secure installation
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Monterey® XT

The original expandable booster, with easy one hand height and width adjustment.

  • MSRP - $119.99
  • The original expandable booster seat
  • 2-in-1 
  • Side impact protection
  • Quick & secure installation
  • Super lightweight
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    Color The Journey

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