Clek Fllo Review

Best Slim Steel-Frame Build (3-Across)

Overall88

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Clek Fllo

Safety notice: Clek recalled Fllo seats made before 21 May 2021 (NHTSA 21C-005, models FL15–FL19): a child could pick small foam pieces out through the crotch-buckle opening, a choking risk. Clek supplies a free insert. Check your seat's model number and date of manufacture at nhtsa.gov/recalls.

Crash test8.7/10

Ease of install (LATCH)8.5/10

Ease of install (belt)8/10

Ease of use5.5/10

Comfort & durability8/10

Weight6.5/10

Pros

• 16.9 in wide, among the narrowest 50 lb rear-facing seats sold
• Rear-facing to 50 lb with an anti-rebound bar
• Lighter than its sibling, the Clek Foonf

Cons

• 14 lb minimum, so it cannot be a newborn's first seat
• Several parts to attach when setting it up rear-facing, and no external harness adjuster
• Long when installed rear-facing, leaving little room to climb past
• Heavy to move between cars at 25 to 28 lb

Our Verdict: Clek Fllo

The Clek Fllo scored 88 out of 100 across the six criteria we score every convertible car seat on, and took Best Slim Steel-Frame Build (3-Across) in our convertible car seat guide.

Width is the reason: 16.9 in across, with a steel anti-rebound bar, a magnesium sub-structure and EAF side-impact foam, and it rear-faces to 50 lb.

Setup takes muscle. Rear-facing needs extra parts attached, the harness adjusts from behind with no external adjuster, and the 14 lb minimum means it follows an infant seat.

Our Analysis, Comparisons and Test Results

Crash test

Eight point seven, bettered only by its sibling the Foonf and the three nine-scoring Gracos. A steel frame and an anti-rebound bar are doing that, and the bar matters most in the mode this seat is built for: rear-facing to 50 lb. Forward-facing runs 26.5 to 65 lb, so the harness stage starts later than on seats that take a child from 22 lb.

Ease of install (LATCH)

Eight and a half, the stronger of its two routes and ahead of where most steel-framed seats land. It will fit tight. What the score does not tell you is the setup cost: several parts have to be attached for the rear-facing configuration, so build it once, carefully, on a day you are not in a hurry, rather than in a parking lot with a crying child.

Ease of install (belt)

Eight, below its anchors score and well behind the Fit360 and the One4Life. Competent rather than clever. The structural issue is length: installed rear-facing the Fllo is long, so in a smaller car the belt path can end up somewhere awkward to reach and there is little room to climb past. Measure the front-to-back space before you commit, not after.

Ease of use

Five and a half, joint lowest in this guide with the Foonf. There is no external harness adjuster, so tightening means reaching in rather than pulling a strap at the front, and the rear-facing setup needs several parts attached. Every journey costs you a little more effort than it would on almost anything else here. If a four in the morning install is in your future, buy differently.

Comfort & durability

Eight, joint best here with the Foonf and the One4Life. Clek builds these to a different standard from the mid-price field and the padding and hardware show it, which is the compensation for everything the install asks of you. Clek rates it for 9 years from manufacture, so check the shell label, and check it twice on a used seat given the pre-2021 recall on this model line.

Weight

Six and a half, and the figure moves depending on how you fit it: 25 lb bare, 28 lb with the anti-rebound bar attached, and you want the bar. That is heavy to shift between cars, so treat it as a fit-once seat. What the mass buys is the thing this seat is actually known for, 16.9 inches across, narrow enough to make a three-across back seat work.

Should You Buy the Clek Fllo?

Buy it if three across is the problem you're solving and you'll fit it once.

At 25 to 28 lb, plan to leave it in the car. The OneFit LX scored two points higher and takes a newborn.

Because every convertible car seat here met the same six criteria, a low column is a trade-off rather than a defect. Work out which column you would notice, then buy on that.

What Other Car Seats Should You Consider?

We scored the Clek Fllo against 11 other convertible car seats on the same criteria. The three closest on score:

Specifications

Conclusion: Clek Fllo

The Fllo took the slim-build award with 88. Ease of use at 5.5 is its lowest mark.

Our convertible car seat guide puts this score beside every other convertible car seat we scored, with the full comparison table.

Tested against 12 other car seats in Best Convertible Car Seat 2026: 13 Seats Compared. See all car seats guides and reviews.