Britax Marathon ClickTight vs Clek Fllo

Both are convertible car seats — here are their published manufacturer specs side by side.

This compares published manufacturer specs — not safety or fit advice. The seat's manual, your vehicle's manual, NHTSA's tools and a certified CPST are the fit-and-safety authority; always check them before installing.

Spec	Britax Marathon ClickTight	Clek Fllo
Stage	Convertible	Convertible
Narrow (3-across)	–	✓
Extended rear-facing	–	✓
FAA-approved	✓	✓
Lightweight / travel	–	–

Britax Marathon ClickTight

5–65 lb

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Clek Fllo

14–65 lb

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As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Weight ranges are the manufacturer's published limits across all modes.

How they differ

the Clek Fllo is listed narrow (roughly ≤17″) for fitting three across a back seat; the Britax Marathon ClickTight isn't listed narrow
the Clek Fllo lists extended rear-facing (a higher rear-facing weight limit, ~40-50 lb); the Britax Marathon ClickTight doesn't

Published limits

Mode	Britax Marathon ClickTight	Clek Fllo
Rear-facing	5–40 lb	14–50 lb · 25–43 in
Forward-facing harness	22–65 lb	26.5–65 lb · 30–49 in
Useful life	10 yrs from manufacture	9 yrs from manufacture

Britax Marathon ClickTight: Rear-facing: 5–40 lb and 49″ or less. Forward-facing: 22–65 lb and 49″ or less (printed limits, same height cap both modes).

Clek Fllo: Rear-facing → forward-facing convertible, no booster mode. Forward-facing recommended at 2+ years (1 year minimum). Same platform/limits as Clek Foonf — cross-checked, both print identical numbers in their current (July 2025) revisions.

Printed verbatim in the manufacturer's manual (Britax Marathon ClickTight User Guide (Canada, P03810500B) · Clek Fllo US Owner's Manual (Jul 2025, rev FL25USF1)); “—” = not published for that mode, “not yet sourced” = we haven't read that manual yet, not that the seat has no limit. How we source these →

Recall record

Britax — 22 on NHTSA's record · Clek — 4 on NHTSA's record.

That is the record of the brand — not a verdict on these models. A recall names specific models and manufacture-date ranges, and a seat missing from the record is not "recall-free": check nhtsa.gov/recalls with the model and date of manufacture on your seat's label. Source: NHTSA, retrieved 2026-09-05.

Where to buy

Britax Marathon ClickTight

See price on Amazon

Clek Fllo

See price on Amazon

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FAQ

What's the difference between the Britax Marathon ClickTight and the Clek Fllo?
The Britax Marathon ClickTight is FAA-approved for aircraft; the Clek Fllo is narrow for 3-across, extended rear-facing, FAA-approved for aircraft. Both are convertible car seats.

Which fits three across, the Britax Marathon ClickTight or the Clek Fllo?
The Clek Fllo is listed narrow (~≤17″) for 3-across; the Britax Marathon ClickTight isn't. Three-across fit still depends on your exact vehicle — confirm before buying.

Which is right for my car and child, the Britax Marathon ClickTight or the Clek Fllo?
That depends on your specific vehicle and child — this page compares published manufacturer specs only, not fit or safety. Check the seat manual, your vehicle manual, NHTSA's car-seat finder and ideally a certified CPST before deciding.

Citing these specs? Go ahead — published manufacturer data, last verified 2026-06-11. Copy a ready-made reference:

More convertible comparisons: Britax Marathon ClickTight vs Diono Radian 3QXT · Britax Marathon ClickTight vs Diono Radian 3RXT · Britax Boulevard ClickTight vs Clek Fllo · Britax Boulevard ClickTight vs Diono Radian 3QXT · all convertible seats · all comparisons