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Cosco Finale DX

The Cosco Finale DX forward-faces up to 65 lb and has an expiration of 10 years, per Cosco. A harness-to-booster seat whose harness mode starts at 40 lb.

  • $74.99List price
  • 65 lbHarness to
  • 100 lbBooster to
See it on Cosco's site

When does it expire?

All harness-to-booster car seats

Finale DX: key facts

  • The Cosco Finale DX forward-faces with a harness from 40 to 65 lb and 43.4 to 49 in tall; works as a booster from 40 to 100 lb and 43.4 to 52 in tall, per Cosco.
  • Outgrown by height: "The tops of your child's ears MUST be below the top of the car seat. (booster: DO NOT use this booster seat if the tops of your child's ears are above the top of the booster seat's headrest.)"
  • It installs with vehicle belt (forward-facing belt path), LATCH lower anchor belt (harness mode), tether (harness mode) or vehicle lap/shoulder belt (booster mode).
  • Cosco says it expires 10 years after the date of manufacture.
  • Cosco lists it as certified for aircraft ("This restraint is certified for aircraft use when used with the internal harness. ... This restraint is not certified for aircraft use when used as a booster seat because aircraft seats do not have shoulder belts.").

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

How the Finale DX stacks up

Against the 22 harness-to-booster car seats we track. The shaded band is where the middle half of them fall; the dot is this one.

Expiration10 years

Within the typical range for harness-to-booster car seats (8 years to 10 years).

This one
6 yearsmiddle 10 years10 years
Forward-facing limit65 lbHighest forward-facing limit of 22 harness-to-booster car seats

The same as most harness-to-booster car seats (65 lb).

This one
40 lbmiddle 65 lb65 lb
Price$74.993rd lowest price of 18

Below the typical range for harness-to-booster car seats ($79.99 to $239.99).

This one
$54.99middle $139.99$349.99

What sets the Finale DX apart

Measured against the 22 harness-to-booster car seats we compare, from each maker's published specs.

Next to its closest matches

Flying with the Finale DX

Cosco's label: “This restraint is certified for aircraft use when used with the internal harness. ... This restraint is not certified for aircraft use when used as a booster seat because aircraft seats do not have shoulder belts.”

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

  • Low price
  • Cosco says it fits three across in most cars
  • Machine-washable pad

Worth checking

  • Harness mode starts at 40 lb, so it is not for smaller toddlers
  • Lower height and weight ceilings than pricier harness boosters

Where to buy the Finale DX

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

Cosco Finale DX
TypeHarness-to-booster
List price$74.99
Forward-facing weight40–65 lb
Forward-facing height43.4–49 in
Booster weight40–100 lb
Booster height43.4–52 in
Head ruleThe tops of your child's ears MUST be below the top of the car seat. (booster: DO NOT use this booster seat if the tops of your child's ears are above the top of the booster seat's headrest.)
Installationvehicle belt (forward-facing belt path), LATCH lower anchor belt (harness mode), tether (harness mode), vehicle lap/shoulder belt (booster mode)
Load legNo
Anti-rebound barNo
RotatesNo
Aircraft labelCertified for aircraft, per the maker
Expires after10 years

Compare the Finale DX with

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

Ask the meadow

Finale DX: questions answered

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

Can you bring the Cosco Finale DX on a plane?

Yes, Cosco lists it as certified for aircraft; look for the red-lettered label that says so. The FAA asks that a car seat go in a window seat so it doesn't block the aisle, and the crew will look for that label.

Finale DX or Chase LX: what's different?

By the makers' specs, the Finale DX lists for $5 less. See every spec side by side.

Is it OK to buy a used Finale DX?

NHTSA publishes guidance on used car seats on its car seat page. Cosco lists a lifespan of 10 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 harness-to-booster car seats

Where these specs come from

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