2026 Complete List of Slim & Narrow Car Seats for 3-Across

Slim and ultra-narrow car seats are a hot trend right now, but it can be hard to know which seat(s) are right for you. We created this list as a resource for parents searching for a slim car seat. We included measurements, weight ranges, and MSRP quotes to help you narrow down which seats might best suit your situation and your budget.

(L to R): Galaxy 360, One4Life Slim, Poplar, Fit3x ClearTex, Revolve360 Slim, EasyTurn 360, SlimFit3 LX

Some of these narrow seats are “All-in-Ones”, meaning they can be used rear-facing, forward-facing, and as a booster. Keep in mind that narrow car seats may not be sufficiently roomy to comfortably accommodate bigger, older children – especially for stockier kids or kids with broad shoulders. If you buy an ultra-narrow All-in-One rated up to 100 lbs. (or more) in booster mode, just be realistic about your expectations.

A seat that is only 17″ wide may be perfect now, but it may not be very comfortable down the line for an older kid who weighs 70+ lbs. There are always tradeoffs. Our advice is to buy the ultra-narrow seat that works for your situation now and in the near future, but be aware that the upper weight range for booster mode (BPB = Belt-Positioning Booster) in most “All-in-One” products may not be realistic.

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Slim Convertible & All-in-One Seats

Model Width Weight Range MSRP
Britax Poplar 17" RF 5-50 / FF 30-65 $319
Britax Poplar S with ARB 17" RF 5-50 / FF 30-65 $379
Britax One4Life Slim 17.5" RF 5-50 / FF 30-65 / BPB 40-120 $359
Britax Galaxy 360 Slim 17" RF 5-50 / FF 30-65 $429
Chicco Fit3x ClearTex 16.7" RF 5-40 / FF 26.5-65 / BPB 40-100 $229
Clek Fllo 17" RF 14-50 / FF 22-65 $429
Clek Foonf 17" RF 14-50 / FF 22-65 $549
Evenflo All4Stages Slim 16.9" RF 4-40 / FF 30-65 / BPB 40-120 $229
Evenflo Revolve360 Slim 16.7" RF 4-50 / FF 30-65 $399
Graco EasyTurn 360 17" RF 5-40 / FF 26.5-65 $349
Graco SlimFit3 LX 16.7" RF 5-40 / FF 26.5-65 / BPB 40-100 $299
Graco True3Fit LX with ARB 16.7" RF 5-40 / FF 26.5-65 / BPB 40-100 $284


Slim FF Harness Booster Combination Seats

Model Width Weight Range MSRP
Chicco MyFit Harness + Booster 17.5" FF 26.5-65 / BPB 40-100 $239


Slim Highback Booster Seats

Model Width Weight Range MSRP
Maxi-Cosi Tanza 17.5" 40-100 $229
Peg Perego Viaggio Flex 120 17.5" (adjustable) 40-120 $299

We hope this information was helpful in narrowing down products that meet your needs!

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Doona vs. Evenflo Shyft DualRide: Battle of the Car Seat Stroller Combos