Peg Perego Viaggio Flex 120 Booster - 4D Adjust for Comfort

In this review of the Viaggio Flex 120 booster, the bottom line is simple: parents who want a highly adjustable, travel-friendly booster for children roughly 40 to 120 lbs will find a lot to like. The seat's standout is the 4D Total Adjust system, which lets the headrest, upper backrest, side wings, and seat recline operate independently to tailor fit as a child grows. Built-in rigid LATCH and aluminum-reinforced backrest add a level of installation stability and impact protection that matters most for longer trips and everyday car use.

Key Features

• 4D Total Adjust: Independent adjustment of the headrest, upper backrest, side wings, and seat lets parents fine-tune fit and comfort for different ages and body sizes.
• Rigid LATCH: Integrated rigid LATCH speeds installation and keeps the booster stable in the vehicle, and it tucks away when not in use for easy storage.
• Comfort recline: Five recline positions allow the seat to be relaxed on long journeys without relying on the car seat angle.
• Aluminum-reinforced backrest: A reinforced backrest provides extra protection against whiplash and added structure for side impact support.
• Compact fold: The booster folds down to a much smaller profile for travel or storage, making it practical for families on the go.

Who It's For

The Viaggio Flex 120 is best for parents of older toddlers up through school-age children who need a booster that adapts as they grow and who frequently move the seat between vehicles or travel with it. Its folding design and tuck-away LATCH make it practical for carpooling, travel, and families with limited trunk space.

Families who prefer simpler, no-frills boosters or who need armrests specifically may want to look elsewhere; this model does not include armrests. Also, those who require a lightweight travel-only option should note the unit weighs about 14 lbs when comparing alternatives.

Pros & Cons

Pros

• Very adjustable fit with the 4D Total Adjust system for long-term use as a child grows.
• Rigid LATCH system is praised for easy installation and secure fit in tight vehicle seats.
• Recline and aluminum-reinforced backrest improve comfort and protection during longer rides.
• Folds compactly for transport and storage, useful for travel or multi-car families.

Cons

• Does not include armrests, which some children or parents prefer for added comfort.
• At about 14 lbs, it is not the lightest booster for frequent carrying despite being foldable.

Specifications

Made in	Italy
Weight range	40 to 120 lbs
Unfolded dimensions (HxLxW)	22 in x 17.25 in x 26.75 in
Folded dimensions	23.5 in x 17.25 in x 9.75 in
Weight	14 lbs
Installation	Integrated rigid LATCH with tuck-away storage
Adjustment	4D Total Adjust: headrest, upper backrest, side wings, seat recline

Our Verdict

The Viaggio Flex 120 is a smart choice for parents who want a long-lasting, highly configurable booster with thoughtful safety and comfort details. The independent adjustments and rigid LATCH make it a practical investment for families who carpool or travel frequently, and the foldable design adds useful portability, delivering strong value for its intended use.

Frequently Asked Questions

Can the booster fold for travel?
Yes. The Viaggio Flex 120 folds down to a compact profile for easier storing and transporting.

Does it install with LATCH?
Yes. It has an integrated rigid LATCH system that locks into place and tucks away when not in use.

What weight range does it support?
The booster is designed for children weighing from 40 to 120 lbs.