SeatFitFindercar seats, by spec

Extended rear-facing convertible car seats

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Convertible seats that carry the extended rear-facing spec — 11 models to shortlist from.

Short answer: Going by each maker's manual, the highest rear-facing limit here is 50 lb (9 of the 11 seats). The forward-facing harness goes up to 65 lb, and high-back booster mode up to 120 lb on the 3 seats that have it. Useful life is 8 to 10 years where the manual gives one.

Fit is decided by your seat manual + your vehicle manual. This page lists published specs to help you shortlist — it is not installation or safety advice, and it does not confirm a seat fits a specific car. Confirm install with the manuals, NHTSA, or a free certified car-seat technician (CPST) check.

Last verified 2026-06-11 · 11 models

Car seatStageNarrow (3-across)Ext. rear-facingFAALightweightBuy
Graco Extend2FitConvertible4–65 lbNHTSA notice 2016Convertible–✓✓–See price
on Amazon
Chicco NextFit MaxConvertible4–65 lbConvertible–✓✓–See price
on Amazon
Nuna RAVAConvertible5–65 lbNHTSA notice 2024Convertible–✓✓–See price
on Amazon
Clek FoonfConvertible14–65 lbNHTSA notice 2021Convertible✓✓––See price
on Amazon
Clek FlloConvertible14–65 lbNHTSA notice 2021Convertible✓✓✓–See price
on Amazon
Diono Radian 3QXTConvertible4–120 lbConvertible✓✓✓–See price
on Amazon
Diono Radian 3RXTConvertible5–120 lbConvertible✓✓✓–See price
on Amazon
Evenflo Revolve360 SlimConvertible4–65 lbNHTSA notice 2025Convertible–✓––See price
on Amazon
Chicco NextFit ZipConvertible5–65 lbConvertible–✓✓–See price
on Amazon
Graco Sequel 65Convertible4–65 lbConvertible–✓✓–See price
on Amazon
Cybex Eternis SConvertible4–120 lbConvertible–✓✓–See price
on Amazon

By published rear-facing weight limits, these keep a child rear-facing (the safest position) longer.

Weight limits and useful life, seat by seat

The weight ranges each maker prints in the seat's manual. Tap a seat to see it side by side with a similar model, with height limits and a link to its manual.

Car seatRear-facingForward-facing harnessHigh-back boosterUseful life
Graco Extend2Fit4–50 lb22–65 lb—10 yrs
Chicco NextFit Max4–50 lb22–65 lb—8 yrs
Nuna RAVA5–50 lb25–65 lb—10 yrs
Clek Foonf14–50 lb26.5–65 lb—9 yrs
Clek Fllo14–50 lb26.5–65 lb—9 yrs
Diono Radian 3QXT4–50 lb22–65 lb40–120 lb10 yrs from purchase
Diono Radian 3RXT5–50 lb22–65 lb40–120 lb10 yrs from purchase
Evenflo Revolve360 Slim4–50 lb22–65 lb——
Chicco NextFit Zip5–40 lb22–65 lb—8 yrs
Graco Sequel 654–40 lb22–65 lb—10 yrs
Cybex Eternis S4–50 lb22–65 lb40–120 lb—

“—” means the manual we cite gives no figure for that mode. Useful life counts from the date of manufacture unless it says “from purchase”. How these are sourced

Common questions

Which extended rear-facing convertible car seats have the highest rear-facing weight limit?

The Graco Extend2Fit, the Chicco NextFit Max, the Nuna RAVA, the Clek Foonf, the Clek Fllo, the Diono Radian 3QXT, the Diono Radian 3RXT, the Evenflo Revolve360 Slim and the Cybex Eternis S list a rear-facing limit of 50 lb, the highest here. The lowest is 40 lb (the Chicco NextFit Zip and the Graco Sequel 65). These are the makers' printed limits; your child's height also has to fit.

How heavy can a child be in the forward-facing harness?

All 11 seats here with a forward-facing harness list 65 lb as the harness limit.

Up to what weight can these be used as a booster?

In high-back booster mode the maximum is 120 lb; the Diono Radian 3QXT, the Diono Radian 3RXT and the Cybex Eternis S go to 120 lb. A booster also needs the seat belt to fit your child, so check the height range in the manual too.

How long do extended rear-facing convertible car seats last before they expire?

The manuals list a useful life of 8 to 10 years. Most count from the date of manufacture; the Diono Radian 3QXT and the Diono Radian 3RXT count from the date of purchase. For 2 of the 11, the manual we cite gives no figure, so check the label on the seat. More by brand on car seat expiration.

Which of these extended rear-facing convertible car seats are narrow enough for 3-across?

4 of the 11 are made narrow for fitting three across: the Clek Foonf, the Clek Fllo, the Diono Radian 3QXT and the Diono Radian 3RXT. Whether three fit depends on your back seat, so test-fit in your car.

Which of these extended rear-facing convertible car seats can be used on a plane?

9 of the 11 are FAA-approved for use on aircraft: the Graco Extend2Fit, the Chicco NextFit Max, the Nuna RAVA, the Clek Fllo, the Diono Radian 3QXT, the Diono Radian 3RXT, the Chicco NextFit Zip, the Graco Sequel 65 and the Cybex Eternis S. Boosters are never approved for planes, because a plane seat has no shoulder belt.

More: all convertible seats · all extended rear-facing seats · how to check fit →