Quick Answer
Clek Fllo Convertible Car Seat Railroad Ziip FR-Free Fabric

Clek Fllo wins on narrow width for 3-across seating; Nuna RAVA wins on extended rear-facing to 50 lbs.

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At a Glance

#ProductAwardPriceOur Score
1
Clek Fllo Convertible Car Seat Railroad Ziip FR-Free FabricClek Fllo Convertible Car Seat Railroad…
Best Overall $429 9.2 Buy →
2
Clek Fllo Convertible Car Seat CarbonClek Fllo Convertible Car Seat Carbon
Classic Clek $329 8.9 Buy →
3
Stokke PIPA by Nuna Infant Car Seat BlackStokke PIPA by Nuna Infant Car Seat Black
Best Nuna Infant $169 8.5 Buy →

Showing 3 of 3 products

Our Top Pick
Clek Fllo Convertible Car Seat Railroad Ziip FR-Free Fabric

Clek Fllo Convertible Car Seat Railroad Ziip FR-Free Fabric

$429
at Amazon
Best for: Parents avoiding flame retardants in car seat fabric

“Compact FR-free convertible ideal for 3-across seating with extended rear-facing.”

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What we like

  • Flame retardant-free fabric
  • Compact 17-inch width for 3-across
  • Extended rear-facing

Watch out for

  • No infant insert included
  • Premium price
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Read Full Analysis

The Clek Fllo Railroad (Ziip FR-Free Fabric) is Clek's standard convertible car seat—the Swedish plus-tested anti-rotation energy-absorbing crumple zone, European steel anti-rebound bar for rear-facing, and GREENGUARD Gold certification without the optional flame-retardant (FR) chemicals in the Ziip fabric. At $400–450, the Clek Fllo is the premium Canadian-manufactured convertible car seat. Clek's Swedish plus extended safety testing is the specific safety certification that justifies the Clek premium—Swedish plus testing is more comprehensive than US FMVSS safety standards, requiring energy management in additional crash scenarios. For parents who research safety beyond minimum compliance, Swedish plus testing is the credential that differentiates Clek from other premium seats. Against Nuna RAVA on this comparison page, Clek Fllo's Swedish plus testing and FR-free fabric options are the safety-focused differentiators. Nuna's GREENGUARD Gold and True Lock installation are Nuna's countering credentials. Both are among the most safety-engineered convertible car seats available—the choice is which specific safety priorities the family prioritizes.

Also Excellent
Clek Fllo Convertible Car Seat Carbon

Clek Fllo Convertible Car Seat Carbon

$329
at Amazon
Best for: Compact rear-facing in vehicles with limited back seat space

“The narrowest premium convertible for tight back seats at 17 inches wide.”

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What we like

  • Narrowest in class at 17 inches
  • Extended rear-facing to 50 lbs
  • GREENGUARD Gold certified

Watch out for

  • Small for tall toddlers
  • Expensive for size class
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Read Full Analysis

The Clek Fllo Carbon is the same Clek Fllo in a specific carbon colorway—the dark charcoal exterior that shows car interior dirt less prominently than lighter colors and the understated aesthetic that many parents prefer for car installation. The safety specifications are identical to the Railroad Ziip: Swedish plus tested, anti-rebound bar rear-facing, GREENGUARD Gold certified FR-free fabric. The colorway selection in Clek's lineup reflects the premium market's attention to aesthetics alongside safety—the Carbon, Marshmallow, and other Clek colors serve buyers who want both the best safety engineering and a specific car interior aesthetic. At the same $400–450 price point as other Clek Fllo configurations, the Carbon is the functional equivalent in a different visual presentation. Against Nuna RAVA on this page, the Clek Fllo Carbon is the same comparison as the Fllo Railroad—Swedish plus safety engineering in a premium convertible at Nuna's pricing competitor.

Worth Considering
Stokke PIPA by Nuna Infant Car Seat Black

Stokke PIPA by Nuna Infant Car Seat Black

$169
at Amazon
Best for: Premium infant car seat with European safety standards

“Nuna-engineered infant seat on Amazon with aluminum frame and ISOFIX compatibility.”

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What we like

  • Nuna safety engineering
  • Lightweight aluminum frame
  • Stokke compatible base system

Watch out for

  • Premium price
  • Best used with Stokke Trailz or Xplory strollers
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Read Full Analysis

The Stokke PIPA by Nuna appears again on the Clek vs Nuna car seat comparison page (also reviewed on the Nuna vs Maxi-Cosi page). In this Clek vs Nuna context, the PIPA by Nuna represents Nuna's infant seat in the comparison against Clek's convertible-focused lineup—Clek doesn't offer an infant car seat, making the Nuna PIPA the infant seat comparison point on a page covering both infant and convertible seats. For the comparison context: the Nuna PIPA infant seat and Clek Fllo convertible serve different use stages. Families who want Nuna's brand throughout the car seat progression might start with PIPA and continue to RAVA, while families prioritizing Swedish plus convertible testing choose Clek Fllo as the dedicated convertible.

Clek vs Nuna Car Seat (2026) Buying Guide

Clek vs Nuna Car Seat (2026)

Quick Verdict: Our top pick is the Clek Fllo Convertible Car Seat Railroad Ziip FR-Free Fabric (Best for 3-Across) — Clek Fllo FR-Free — 17 inches wide, the narrowest full-featured convertible for tight installs.. Priced at $429.99.

Budget Pick: The Stokke PIPA by Nuna Infant Car Seat Black at $169.99 — Stokke PIPA by Nuna — infant seat with Nuna engineering on Amazon..

Great for: Every parent or caregiver transporting a child — correct car seat use is the single most effective child safety measure in vehicles

Clek Fllo Convertible Car Seat Railroad Ziip FR-Free Fabric
Clek Fllo Convertible Car Seat Railroad Ziip FR-Fr...
$429.99
See Full Review →

Not ideal if: Your child has outgrown the seat's height or weight limit — using an expired size is a safety risk, not a cost-saving

Clek and Nuna compete at the very top of the convertible car seat market. Clek Fllo's key differentiator is its 17-inch width — the narrowest full-featured convertible available, making 3-across seating possible in most mid-size vehicles. It also offers flame-retardant-free fabric versions (the Ziip line), important for parents concerned about chemical exposure. Nuna RAVA's standout feature is the 50 lb rear-facing limit — 10 lbs more than most premium competitors — combined with True Lock LATCH that audibly confirms correct installation. Both are GREENGUARD Gold certified for low chemical emissions. Car seat safety is more than strapping it in — our complete car seat safety guide covers installation, rear-facing limits, expiration dates, and transition timing.

Related Guides

Who This Is For Infant car seats serve birth to approximately 35 lbs (varies by model); convertible seats carry children from birth through booster age (typically 40–65 lbs); all-in-one seats grow with a child from infancy through a high-back booster. The right seat depends on how long you want the seat to last, your vehicle's back seat dimensions, and how often you'll move it between cars.

What to Look For

What's The Best Infant Car Seat? Nuna Pipa RX vs. Clek Liing
What's The Best Infant Car Seat? Nuna Pipa RX vs. Clek Liing
*Crash test ratings:* The NHTSA 5-Star Safety Rating and IIHS "Best Bet" designation are the two most trusted benchmarks. Check both, as test protocols differ. *LATCH and belt path:* Lower anchors are easier to install correctly than seatbelt installs — but lower anchor weight limits (usually 40–65 lbs combined child + seat) mean belt installs are required for larger children. *Recline angle:* Rear-facing seats need the correct recline for airway protection. Most have a built-in angle indicator; ensure your vehicle's seat pitch allows proper positioning. *Ease of cleaning:* Covers should be machine washable. Straps cannot be machine washed — spot clean only. Common Mistakes to Avoid The #1 installation error is a loose install — the seat should not move more than 1 inch side-to-side or front-to-back when tested at the belt path. Get a free installation check at a certified Child Passenger Safety Technician (CPST) inspection station before the first use. Safety Standards All car seats sold in the US must meet FMVSS 213 (Federal Motor Vehicle Safety Standard). Look for seats that have also passed IIHS side-impact and CPS Tech independent testing. Price Context Infant seats range from $80–$350. Convertible seats run $150–$500. All-in-one seats cost $250–$600. Price does not directly correlate with safety — a correctly installed $150 seat outperforms a poorly installed $400 seat.

Watch Before You Buy

Frequently Asked Questions

Is Clek or Nuna better?
Clek Fllo wins if you have multiple children needing 3-across seating or are buying for a smaller vehicle. Nuna RAVA wins if you want maximum rear-facing duration and a highly secure LATCH system. Both are top-tier — the decision comes down to your specific vehicle and family configuration.
Is Clek Fllo worth the price?
For families fitting three car seats across in one row, Clek Fllo at 17 inches is often the only option that fits. In that context it's absolutely worth the premium price — there is no cheaper seat that achieves the same width.
What makes Nuna RAVA different from other convertibles?
Nuna RAVA rear-faces to 50 lbs, significantly longer than the typical 40 lb limit. It has True Lock LATCH with an audible click confirmation, a steel anti-rebound bar, and a one-second magnetic buckle. The premium fabric uses OEKO-TEX certified materials.
What is the highest-rated infant car seat?
The Nuna PIPA and Chicco KeyFit 35 series consistently rank at the top of infant car seat ratings for safety, ease of installation, and comfort. The Stokke PIPA by Nuna on this page is a premium version of the Nuna PIPA lineup. Britax Willow S and Graco SnugRide SnugFit 35 are also highly rated at lower price points. All car seats sold in the US must meet federal safety standards; the differences between top-rated seats are in ease of use and comfort features.
Why are Clek car seats so expensive?
Clek car seats are priced at a premium for several reasons: they use a rigid LATCH installation system (rather than flexible straps) that creates a stiffer, more precise connection to the vehicle, they are designed and manufactured in North America with rigorous quality standards, and they use energy-absorbing materials in the shell that exceed minimum federal requirements. The Clek Fllo on this page is one of the narrowest full-featured convertible seats available, making it particularly useful in smaller vehicles or when fitting three car seats across.

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