BudgetPlan your spend Hospital bagFree checklist

Harness-to-booster car seats

Q: Which harness-to-booster seats are made without added flame retardants?

4 of the 28 we track say so, per each maker. The lowest list price is the Britax Grow with You Harness-to-Booster at $239.99. They still meet the federal flammability standard for vehicle interiors (FMVSS 302).

Forward-facing with a harness, then a belt-positioning booster for big kids.

Empty sage harness-to-booster car seat with five-point harness in a car back seat

28models tracked
$54 to $349price range
40 lb–65 lbforward-facing limit

Harness-to-booster car seats by budget

The 20 harness-to-booster car seats with a published list price, split into thirds by price. A to Z within each lane. Price isn't a quality rating.

All 28 harness-to-booster car seats

Must have:

✓ maker says yes ✕ maker says no ? not published Confirmed only Sort

Compare								Certified for aircraft	No added flame retardants
	Baby Trend Hybrid SI 3-in-1harness to 50 lbCertified for aircraft	$99.99	–	50 lb	100 lb	–	16 lb	✓	?
	Britax Grow with You ClickTight Harness-to-Boosterharness to 65 lbCertified for aircraft	$349.99	–	65 lb	120 lb	–	25 lb	✓	?
	Britax Grow with You Harness-to-Boosterharness to 65 lbCertified for aircraftNo added flame retardants	$239.99	–	65 lb	120 lb	–	23 lb	✓	✓
	Chicco MyFitharness to 65 lb, 17.5 in wideCertified for aircraft	$239.99	–	65 lb	100 lb	17.5 in	25 lb	✓	?
	Chicco MyFit Air ClearTex Harness + Boosterharness to 65 lb, 17.5 in wideCertified for aircraftNo added flame retardants	$269.99	–	65 lb	100 lb	17.5 in	25 lb	✓	✓
	Chicco MyFit ClearTex Harness + Boosterharness to 65 lb, 17.5 in wideCertified for aircraftNo added flame retardants	$249.99	–	65 lb	100 lb	17.5 in	25 lb	✓	✓
	Cosco Finale 2-in-1harness to 65 lbCertified for aircraft	$54.99	–	65 lb	100 lb	–	–	✓	?
	Cosco Finale DXharness to 65 lbCertified for aircraft	$74.99	–	65 lb	100 lb	–	–	✓	?
	Disney Baby Finale 2-in-1 Harness Boosterharness to 65 lbCertified for aircraft	$79.99	–	65 lb	100 lb	–	–	✓	?
	Disney Baby MagicSquadharness to 65 lbCertified for aircraft	$179.99	–	65 lb	100 lb	–	–	✓	?
	Evenflo Chase LXharness to 40 lb, 21.9 in wideCertified for aircraft	$79.99	–	40 lb	100 lb	21.9 in	9.14 lb	✓	?
	Evenflo Chase Plusharness to 40 lb, 21.9 in wideCertified for aircraft	$64.99	–	40 lb	100 lb	21.9 in	9.5 lb	✓	?
	Evenflo Maestro Sportharness to 50 lb, 19 in wideCertified for aircraft	$99.99	–	50 lb	100 lb	19 in	9.6 lb	✓	?
	Graco Nautilus 2.0 LX ft. InRight LATCH 3-in-1harness to 65 lb, 19.4 in wide	–	–	65 lb	120 lb	19.4 in	17.4 lb	?	?
	Graco Tranzitionsharness to 65 lb, 19 in wide	$139.99	–	65 lb	100 lb	19 in	14 lb	?	?
	Harmony Defender 360° MAX 3-in-1 Deluxeharness to 65 lbCertified for aircraft	–	–	65 lb	120 lb	–	18 lb	✓	?
	Joie Bay Latch SI 3-in-1 Harness Boosterharness to 65 lb, 19 in wideCertified for aircraft	$239.99	–	65 lb	120 lb	19 in	23.7 lb	✓	?
	Joie bay latch SI plusharness to 65 lb, 19 in wideCertified for aircraft	$269.99	–	65 lb	120 lb	19 in	23.7 lb	✓	?
	Nuna LUMNharness to 65 lb, 18.25 in wideCertified for aircraftNo added flame retardants	–	–	65 lb	110 lb	18.25 in	26.2 lb	✓	✓
	Safety 1st Boost-and-Goharness to 65 lbPrevious generationCertified for aircraft	–	–	65 lb	100 lb	–	–	✓	?
	Safety 1st Comfort Ride 3-in-1harness to 65 lbCertified for aircraft	$84	–	65 lb	100 lb	–	–	✓	?
	Safety 1st Grand 2-in-1harness to 65 lbCertified for aircraft	$79.99	–	65 lb	100 lb	–	–	✓	?
	Baby Trend Hybrid 3-in-1harness to 50 lbDiscontinuedCertified for aircraft	$99.99	–	50 lb	100 lb	–	16 lb	✓	?
	Chicco MyFit Zipharness to 65 lb, 17.5 in wideDiscontinuedCertified for aircraft	$249.99	–	65 lb	100 lb	17.5 in	25 lb	✓	?
	Chicco MyFit Zip Airharness to 65 lb, 17.5 in wideDiscontinuedCertified for aircraft	–	–	65 lb	100 lb	17.5 in	26 lb	✓	?
	Graco Nautilus 2.0 3-in-1harness to 65 lb, 19.4 in wideDiscontinued	–	–	65 lb	120 lb	19.4 in	17.8 lb	?	?
	Graco Nautilus SnugLock Grow 3-in-1harness to 65 lb, 19.37 in wideDiscontinued	–	–	65 lb	120 lb	19.37 in	20.28 lb	?	?
	Harmony Defender 360° 3-in-1 Deluxeharness to 65 lbDiscontinued	–	–	65 lb	120 lb	–	–	?	?

Harness-to-booster car seats by the numbers

The 28 we compare, from each maker's published specs. Ranges, not ratings.

Expiration6 years to 10 years; the middle half 8 years to 10 years (22 of 28 publish it)
Forward-facing limit40 lb to 65 lb; the middle half 65 lb to 65 lb (28 of 28 publish it)
Width17.5 in to 21.9 in; the middle half 17.5 in to 19.4 in (15 of 28 publish it)
Weight9.1 lb to 26.2 lb; the middle half 16 lb to 25 lb (20 of 28 publish it)
Price$54.99 to $349.99; the middle half $79.99 to $239.99 (20 of 28 publish it)

From the American Academy of Pediatrics

Maker limits: harness-to-booster car seats

Highest listed limit first. 22 of 28 list an expiration, from 6 to 10 years after manufacture.

Seat	Forward, harness	Booster	Expires after
Harmony Defender 360° 3-in-1 Deluxe	26.5–65 lb	40–120 lb	10 years
Harmony Defender 360° MAX 3-in-1 Deluxe	26.5–65 lb	40–120 lb	10 years
Joie Bay Latch SI 3-in-1 Harness Booster	30–65 lb	40–120 lb	10 years
Joie bay latch SI plus	30–65 lb	40–120 lb	10 years
Britax Grow with You ClickTight Harness-to-Booster	30–65 lb	40–120 lb	9 years
Britax Grow with You Harness-to-Booster	30–65 lb	40–120 lb	9 years
Graco Nautilus 2.0 LX ft. InRight LATCH 3-in-1	26.5–65 lb	40–120 lb
Graco Nautilus 2.0 3-in-1	26.5–65 lb	40–120 lb
Graco Nautilus SnugLock Grow 3-in-1	22–65 lb	40–120 lb
Nuna LUMN	30–65 lb	40–110 lb	10 years
Safety 1st Comfort Ride 3-in-1	30–65 lb	40–100 lb	10 years
Cosco Finale DX	40–65 lb	40–100 lb	10 years
Safety 1st Grand 2-in-1	40–65 lb	40–100 lb	10 years
Disney Baby Finale 2-in-1 Harness Booster	40–65 lb	40–100 lb	10 years
Cosco Finale 2-in-1	40–65 lb	40–100 lb	10 years
Disney Baby MagicSquad	30–65 lb	40–100 lb	10 years
Safety 1st Boost-and-Go	30–65 lb	40–100 lb	10 years
Chicco MyFit ClearTex Harness + Booster	26.5–65 lb	40–100 lb	8 years
Chicco MyFit Zip	25–65 lb	40–100 lb	8 years
Chicco MyFit Air ClearTex Harness + Booster	26.5–65 lb	40–100 lb	8 years
Chicco MyFit	26.5–65 lb	40–100 lb	8 years
Chicco MyFit Zip Air	25–65 lb	40–100 lb	8 years
Graco Tranzitions	26.5–65 lb	40–100 lb	7 years
Baby Trend Hybrid 3-in-1	30–50 lb	40–100 lb	6 years
Baby Trend Hybrid SI 3-in-1	30–50 lb	40–100 lb	6 years

Showing the first 25 of 28.

Weights and heights as each maker lists them. Follow the labels on your seat.

Shortlist: 3 models, each highest or lowest on one spec

Ranked on the maker's published numbers only. Not a safety or quality rating.

Highest forward-facing limit · Narrowest ChiccoMyFit ClearTex Harness + Booster 65 lb
Highest forward-facing limit: the Chicco MyFit ClearTex Harness + Booster at 65 lb, per Chicco.

Expiration
8 years
Width
17.5 in
Weight
25 lb
See specs
Lightest EvenfloChase LX 9.1 lb
Lightest: the Evenflo Chase LX at 9.1 lb, per Evenflo.

Forward-facing limit
40 lb
Width
21.9 in
Price
$79.99
See specs
Lowest price CoscoFinale 2-in-1 $54.99
Lowest price: the Cosco Finale 2-in-1 at $54.99, per Cosco.

Expiration
10 years
Forward-facing limit
65 lb
See specs

About harness-to-booster car seats

A harness-to-booster seat is forward-facing only: a 5-point harness for preschoolers, then a belt-positioning booster. Check the maker's minimum age, weight and height.

Key facts

We track 28 seats here from 11 brands, with limits taken from each maker. Last checked 2026-11-06.
Published widths run from 17.5 in (Chicco MyFit ClearTex Harness + Booster) to 21.9 in.
Maker expiration periods run from 6 to 10 years from the date of manufacture.
23 seats list FAA approval for aircraft. Boosters aren't certified for use on planes.

Computed from each maker's published specs, last checked 2026-11-06.

What to look for in harness-to-booster car seats

The range across every car seat here, with the typical middle half shaded and the shortlist marked.

Expiration

Years from the date of manufacture until the maker says to stop using the seat.

6 yearsmiddle 10 years10 years

Typical: 8 years to 10 years. 22 of 28 list it.

Forward-facing limit

The maker's forward-facing weight limit.

MyFit ClearTex Harness + Booster

40 lbmiddle 65 lb65 lb

Most list 65 lb. 28 of 28 list it. Highest forward-facing limit: MyFit ClearTex Harness + Booster.

Width

Matters for fitting three across or a tight back seat.

17.5 inmiddle 19 in21.9 in

Typical: 17.5 in to 19.4 in. 15 of 28 list it.

Weight

You feel this every time you lift it into a trunk, up stairs, or onto a bus.

Chase LX

9.1 lbmiddle 23 lb26.2 lb

Typical: 16 lb to 25 lb. 20 of 28 list it. Lightest: Chase LX.

Price

What it lists for at the maker or a major store. Sales move this often.

Finale 2-in-1

$54.99middle $139.99$349.99

Typical: $79.99 to $239.99. 20 of 28 list it. Lowest price: Finale 2-in-1.

Shop by what matters

FAA-approved car seats for travel (201)

From NHTSA

From NHTSA: "Your child under age 1 should always ride in a rear-facing car seat." Stay rear-facing "until he or she reaches the top height or weight limit allowed by your car seat's manufacturer." (NHTSA) Find a certified Child Passenger Safety Technician through NHTSA. Check the label and the maker's instructions, and ask your pediatrician about your child.

Ask the meadow

Questions about harness-to-booster car seats

Answers come from each maker's published specs. Safety and health questions link to the agency or medical source.

Are expensive harness-to-booster seats worth it?

Every harness-to-booster seat sold in the US must meet the same federal crash standard (FMVSS 213); price buys features and materials. Among the 20 with a list price, 33% of the priciest third have no added flame retardants, versus 0% of the cheapest third. The cheapest third lists under $80.

Which harness-to-booster seats are made without added flame retardants?

4 of the 28 we track say so, per each maker. The lowest list price is the Britax Grow with You Harness-to-Booster at $239.99. They still meet the federal flammability standard for vehicle interiors (FMVSS 302).

How long do harness-to-booster seats last before they expire?

Between 6 and 10 years from the manufacture date, for the 22 that publish one. The longest is the Harmony Defender 360° 3-in-1 Deluxe at 10 years. The date of manufacture is on the seat's label; try the expiration calculator.

Do I need a new car seat after an accident?

After a crash, follow your seat's manual and NHTSA's guidance. 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.

Most-compared pairs

Side-by-side specs for the closest rivals in this category.