The new Chicco Fit3x is the latest ultra-slim car seat, and we’re blown away by everything Chicco managed to pack into this very narrow All-in-One! They squeezed an impressive number of features into a skinny car seat at a reasonable price. If you need to fit 3-across or just 2 seats side-by-side, the Chicco Fit3x should be on your shortlist!

Boasting tall harness slots, a narrowness that works in many 3-across situations, a robust ClickTight installation system, and naturally flame-retardant fabrics that are machine wash- and dryable, the Britax Poplar and Poplar S convertible carseats seem to be perfect. But nothing is that perfect, right?

The Britax One4Life Slim ClickTight All-in-One car seat has a mile-long list of features: a robust ClickTight belt-tensioning lockoff panel, a top harness slot height higher than most harness-to-booster seats, a top shoulder belt guide higher than most dedicated belt-positioning booster seats, flame retardant-free machine washable fabrics, and more! What else could we talk about in our review? Plenty.

A comprehensive list of 2026 car seat models that are marketed as being “FR-free”. The list is grouped by type of car seat (infant, convertible, booster, etc.) to make it easier to find what you’re looking for!

Chicco has taken a tried-and-true, well-loved infant seat and upped the ante by adding a no-rethread harness, an anti-rebound bar, and the option to install the carrier Euro-style when traveling without the base. The KeyFit Max fits babies well, especially itty bitty ones, and is easy to use for new and experienced parents alike.