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Cosco Finale DX 2-in-1 Booster Car Seat

A harness-to-booster seat with 2 modes: forward-facing harness 40 to 65 lb, 43.4 to 49 in; belt-positioning booster (high-back) 40 to 100 lb, 43.4 to 52 in.

At a glance

Fits children from 40 to 100 lb
Up to 52 in tall
2 modes: forward-facing harness, belt-positioning booster (high-back)
10-year usable life
Certified for aircraft use

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Cosco product page Manual

Specifications checked against Cosco’s US site and manual on September 17, 2026. Not hands-on tested. How I research

Who the Finale DX 2-in-1 Booster Car Seat fits

This seat covers 2 stages, and a child has to meet every limit of the stage they are in. Cosco gives it a 10-year life from the date of manufacture, so check the date label before using a hand-me-down.

Forward-facing harness40 to 65 lb · 43.4 to 49 in: The child faces forward in the seat’s own harness. Use the top tether every time, and stay in the harness until the child outgrows it.
Belt-positioning booster (high-back)40 to 100 lb · 43.4 to 52 in: The seat’s own back and belt guide route the vehicle belt across the shoulder, and the sides give the child something to lean on when they sleep.

A school-age child with a backpack beside an empty high-back booster

What are the Finale DX 2-in-1 Booster Car Seat weight, height and age limits?

Cosco Finale DX 2-in-1 Booster Car Seat limits by mode
Mode	Child weight	Child height	Minimum age	Conditions
Forward-facing harness	40 to 65 lb	43.4 to 49 in	Not published	Manual: do not use lower anchors for a child over 50 lb.
Belt-positioning booster (high-back)	40 to 100 lb	43.4 to 52 in	Not published	—

A child must meet every limit for the mode they use. The labels on your seat and its manual are the final word.

Finale DX 2-in-1 Booster Car Seat specifications

Seat weight: Not published
Width: Not published
Usable life: 10 years
Aircraft use: Certified for aircraft (see manual for which modes)
Lower anchor max child weight: 50 lb

How the Finale DX 2-in-1 Booster Car Seat installs

Lower anchors: Lower anchors (harness mode). Check your vehicle manual for which seating positions have anchors, and switch to the seat belt once the child passes the anchor weight limit in the manual.
Harness: 5-point harness. Check the harness height at each growth spurt: at or below the shoulders rear-facing, at or above them forward-facing.

Every install is a fit between one seat and one vehicle. Read both manuals, and use a free inspection station if anything is unclear.

An empty car seat installed on a back seat, seen through an open car door

Will it fit your car?

Cosco does not publish a width for this seat, so measure your back seat and compare it with the seat in a store before buying.

Check your vehicle manual for lower anchor positions and any head-restraint rules.
Rear-facing seats need front-seat room: try the install behind the driver before you commit.
Certified for aircraft use, so it can travel as a seat rather than checked baggage.

What features does the Finale DX 2-in-1 Booster Car Seat have?

5-point harness
Top tether (harness mode)
Lower anchors (harness mode)
Certified for aircraft use with internal harness

Colors listed in the US

Dusk, Organic Waves, Rainbow.

Is the Finale DX 2-in-1 Booster Car Seat recalled?

No campaign in the current NHTSA child-restraint data names this model family, and I have not run a separate review for it. Check your seat’s model number and date of manufacture before use.

NHTSA recall search · Recent car seat recalls

Before you buy

Weigh and measure your child. The limits above are the manufacturer’s, and a child has to meet all of them for the mode they will use.
Confirm the exact version. Colors, retail exclusives and model numbers change limits more often than you would expect; Cosco lists 3 colors of this seat.
Read the manual before you buy, not after. It is linked above and holds the fit rules, the install methods and the expiry.
Check recalls by model number and date of manufacture, and register the seat with Cosco so you hear about the next one.

Sources

Other Cosco booster seats

Model	Top child weight	Seat weight	Width	Usable life
Finale DX 2-in-1 Booster Car Seat (this seat)	100 lb	—	—	10 years
Finale 2-in-1 Booster Car Seat	100 lb	—	—	10 years
Pronto! Trend Belt-Positioning Booster Car Seat	100 lb	—	—	10 years
Rise LX Booster Car Seat	100 lb	—	—	10 years
Topside Booster Car Seat (BC214)	100 lb	—	—	10 years
Topside Booster Car Seat (BC030)	100 lb	—	—	—