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Britax Skyline 2-Stage Belt-Positioning Booster

A 2-in-1 booster seat with 2 modes: high-back booster 40 to 120 lb, 44 to 63 in; backless booster 48 to 120 lb, 46 to 63 in.

At a glance

Fits children from 40 to 120 lb
Up to 63 in tall
2 modes: high-back booster, backless booster
Seat weighs 11 lb
10-year usable life

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Britax product page Manual

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

Who the Skyline 2-Stage Belt-Positioning Booster fits

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

High-back booster40 to 120 lb · 44 to 63 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.
Backless booster48 to 120 lb · 46 to 63 in: Only the base is left, so the vehicle seat has to support the child’s back and head, and the belt guide sits at the hip.

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

What are the Skyline 2-Stage Belt-Positioning Booster weight, height and age limits?

Britax Skyline 2-Stage Belt-Positioning Booster limits by mode
Mode	Child weight	Child height	Minimum age	Conditions
High-back booster	40 to 120 lb	44 to 63 in	Not published	Seated shoulder height up to 21.5 in
Backless booster	48 to 120 lb	46 to 63 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.

Skyline 2-Stage Belt-Positioning Booster specifications

Seat weight: 11 lb
Width: Not published
Usable life: 10 years
Aircraft use: Not certified for aircraft
Dimensions as stated: 16" x 21" x 27.5"
Headrest positions: 10
Buckle strap depth: 8.5 in
Seat area depth: 14 in
Seat area width: 12 in
Shoulder width: 15 in
Max seated shoulder height: 21.5 in

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

Will it fit your car?

Britax does not publish a width for this seat, so measure your back seat and compare it with the seat in a store before buying. It weighs 11 lb, which matters if you will move it between cars or carry it through an airport.

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.
Not certified for aircraft use: plan on gate-checking it or using a different seat to fly.

What features does the Skyline 2-Stage Belt-Positioning Booster have?

Converts high-back to backless
Quick-push lower connectors
10-position headrest

Colors listed in the US

Dusk.

Is the Skyline 2-Stage Belt-Positioning Booster 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.
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 Britax so you hear about the next one.

Sources

Other Britax booster seats

Model	Top child weight	Seat weight	Width	Usable life
Skyline 2-Stage Belt-Positioning Booster (this seat)	120 lb	11 lb	—	10 years
Grow With You ClickTight Harness-2-Booster Car Seat	120 lb	25 lb	—	9 years
Grow With You Harness-2-Booster Car Seat	120 lb	23 lb	—	9 years
Highpoint 2-Stage Belt-Positioning Booster	120 lb	12 lb	—	10 years
UpNGo Backless Booster Seat	120 lb	3.1 lb	17.1 in	10 years
UpNGo Click Backless Booster Seat	120 lb	4.5 lb	17.1 in	10 years