Back in 2008, the original American expandable booster seat was created right here at Diono. Fast forward to today as we welcome the next evolution in a long-standing legacy. We’ve taken the award-winning Monterey and painstakingly engineered 15 upgrades to create the Monterey 4DXT. From the remodeled headrest, enhanced fabric covering, contoured seat base, and breathable exo-shell panels, we’ve considered every last detail to create a contemporary new look. Like all Diono boosters, expect up to 8 years of service, so you can rest assured the Monterey 4DXT will be with you for the long haul.

Side Impact Protection: The height and width can be adjusted independently for safety that envelopes their head and shoulders up to 12 years of age.

Total Child Comfort: Features the Diono 3-layer Side Impact Protection System built in. From the EPP foam coating to the molded rigid shell casing, we’ve got your little one covered.

Always Travel Ready: The ergonomically contoured seat base and remodeled headrest improves the child seating position with luxury AIRTEK foam cushioning for total child comfort.

Easy to Store: The Monterey booster seat is super portable, lightweight and easy to store with a great flat pack feature that makes for a perfect travel companion for your little one.

• Ultimate luxury and all-star safety.
• Improved cup holders, fully covered backrest, ergonomically contoured base, and a luxury memory foam seat.
• ExoShell Side Panels and 3x layer Side impact protection.
• Easy installation, fully covered backrest and buckle friendly fit.
• Cover machine washable on cold cycle.
• Height 34.45″, Width 24.41″, Depth 17.9″ Weight 16.98lbs