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Mifold Hifold

The Mifold Hifold is 15.6 in wide, weighs 10 lb, and has a booster weight limit of 100 lb, per Mifold. A folding high-back booster built for travel, with many adjustment combinations.

  • $249.99List price
  • 100 lbBooster to
  • 10 lbSeat weight
  • 15.6 inWidth
See it on Mifold's site

When does it expire?

Follow Mifold

All booster seats

Hifold: key facts

  • The Mifold Hifold works as a booster from 40 to 100 lb and 43.5 to 59 in tall, per Mifold.
  • It installs with seat belt.
  • Mifold says it expires 7 years after the date of manufacture.
  • Mifold says it isn't certified for aircraft.
  • It's 15.6 in wide at the widest point and weighs 10 lb.

From Mifold's manual and published specs. Always follow the limits on your seat's labels.

How the Hifold stacks up

Against the 65 booster seats we track. The shaded band is where the middle half of them fall; the dot is this one.

Booster weight limit100 lb44th highest booster limit of 64

Within the typical range for booster seats (100 lb to 120 lb).

This one
100 lbmiddle 110 lb120 lb
Expiration7 years

Below the typical range for booster seats (8 years to 10 years).

This one
6 yearsmiddle 10 years12 years
Width15.6 in3rd narrowest of 31

Below the typical range for booster seats (17 in to 18.6 in).

This one
10.2 inmiddle 17.3 in23.2 in
Weight10 lb23rd lightest of 42

Within the typical range for booster seats (6 lb to 13.2 lb).

This one
1.8 lbmiddle 9.8 lb20.9 lb
Price$249.9947th lowest price of 53

Above the typical range for booster seats ($55.99 to $159.99).

This one
$19.98middle $79.99$399.99

What sets the Hifold apart

Measured against the 65 booster seats we compare, from each maker's published specs.

  • 3rd narrowestof the 31 booster seats with it published: 15.6 in
  • Weight: 10 lbin the middle half of the 42 booster seats that publish it (6 lb to 13.2 lb)

Next to its closest matches

Flying with the Hifold

Mifold's label: “This child restraint is NOT certified for use in aircraft.” American lists “Booster seats with no approval label or shoulder harness” under seats and devices not approved for use on board (source).

What airlines say about car seats:

  • American: “Each ticketed customer is allowed 1 stroller and 1 car seat to be checked free of charge” “If an unoccupied, adjoining seat is not available, the gate agent will check the safety seat to your final destination.” Source
  • Alaska: “We will transport your child's car seat and stroller free of charge as checked baggage.” Source
  • JetBlue: “Checking a child safety seat will not count towards your checked baggage allowance and there is no fee assessed” Source
  • Spirit: “One (1) car seat will be accepted per child as checked baggage at no charge.” Source
  • Frontier: “strollers and car seats can be checked for free.” Source
  • Allegiant: “There is no charge for checking or gate checking one car seat per fare-paying passenger.” Source
  • Breeze: “Child seats may be carried on board the aircraft if a seat has been purchased for the Infant or Child” Source

Quoted from each airline's page as of 2026-11-02.

Listed features

  • Folds to 13.5 x 13.5 x 10.7 in with a carry strap
  • Machine-washable covers
  • 243 adjustment combinations

Worth checking

  • List price $249.99
  • 10 lb, heavy for a travel seat
  • Max 100 lb

Where to buy the Hifold

Prices and availability change. We may earn a commission from some links.

good to know
  • Check for recalls: Search the agency's recall list with the model number and date code from the label: NHTSA recall search.
  • Car seat use and installation: see NHTSA's car seat page, which also lists free car seat inspection by certified technicians. Check the label and the maker's instructions, and ask your pediatrician about your child.

Full specs

Mifold Hifold
TypeBooster
List price$249.99
Booster weight40–100 lb
Booster height43.5–59 in
Seat weight10 lb
Width15.6 in
Installationseat belt
Load legNo
Anti-rebound barNo
RotatesNo
Aircraft labelNot certified for aircraft
Expires after7 years

Compare the Hifold with

How each closest rival differs from the Hifold, from the makers' specs.

Ask the meadow

Hifold: questions answered

From Mifold's published specs, last checked 2026-11-06.

Will the Mifold Hifold fit three across or in a small car?

It's narrower than 94% of the boosters we track, at 15.6 in. The narrowest is the Mifold Comfort Grab-and-Go Booster at 10.2 in. Fit depends on your vehicle; check each seat's manual and your vehicle manual. Car seat use and installation: see NHTSA's car seat page, which also lists free car seat inspection by certified technicians. Check the label and the maker's instructions, and ask your pediatrician about your child.

Can you bring the Mifold Hifold on a plane?

Mifold doesn't list it as certified for aircraft, so it can be checked as luggage but not used in the plane seat. See seats approved for planes.

Hifold or Monterey 5iST FixSafe: what's different?

By the makers' specs, the Hifold lists for $10 less. See every spec side by side.

Is it OK to buy a used Hifold?

NHTSA publishes guidance on used car seats on its car seat page. Mifold lists a lifespan of 7 years from manufacture for this model. Check the label and the maker's instructions, and ask your pediatrician about your child.

Still wondering? Write to us at hello@cribpicks.com and we'll look it up.

More booster seats

Where these specs come from

Last checked 2026-11-06. Spot something wrong? Tell us. Read our editorial and safety policy and corrections.