Carhartt CMF6366 6-Inch Rugged Flex Composite Toe Work Boot

Carhartt CMF6366 Composite Toe Work Boot — Lightweight Metal-Free Leather Boot

The Carhartt CMF6366 composite toe work boot is Carhartt's workhorse metal-free leather boot: an oil-tanned full-grain upper over a lightweight non-metallic composite toe that meets ASTM F2413. It is the pick for tradespeople who want a lighter, airport-friendly cap and a leather boot that breaks in fast and lasts.

Features · Specs · Fit & Sizing · Comparison · FAQ

The Carhartt CMF6366 is a 6-inch oil-tanned leather work boot with a non-metallic ASTM F2413 composite safety toe and a Rugged Flex outsole, built as a lightweight everyday trades boot.

Key features

• Non-metallic composite safety toe meets ASTM F2413 impact and compression at a lighter weight than steel
• Oil-tanned full-grain leather upper resists scuffs and conditions well over time
• Carhartt Rugged Flex outsole flexes with the foot to cut fatigue
• Cement construction keeps overall weight down for all-day wear
• Padded collar and tongue for comfort on lace-up
• Roomy composite toe box that does not conduct cold like a steel cap

Specifications

Where this boot fits

The CMF6366 fits general trades, carpentry, and warehouse work where you want a light, non-conductive toe and a leather boot rather than a synthetic sneaker. It is not waterproof, so keep it to dry sites or seal it with items from our boot care and waterproofing collection. Pair it with a supportive insole from our work boot insoles range and durable work socks for long shifts.

Fit, sizing, and metal-free advantage

The CMF6366 runs true to size for most wearers, though the composite toe box is slightly narrower than the Timberland Boondock; order a half size up if you have a wide forefoot. It sits in our composite toe boots range as the value leather pick, next to the waterproof Timberland PRO Boondock and the CarbonMAX Wolverine Overpass. See how metal-free stacks up in our steel toe vs composite toe guide.

Every metal-free boot on this page skips the steel cap, so it will not conduct cold into the toe box and it clears metal detectors at airports, courthouses, and secure facilities. If you are choosing between materials, our steel toe vs composite toe comparison and our how to choose safety boots guide walk through weight, conductivity, and compliance so you order the right cap the first time.

How it compares to its siblings

• Choose this Carhartt model when you want a lightweight leather composite boot for dry-site general trades at strong value.
• Consider the Timberland PRO Boondock (Timberland PRO Boondock) when you want maximum rugged toughness and lug grip for demolition and rough terrain.
• Consider the Wolverine Overpass (Wolverine Overpass) when you want athletic lace-up flex and ankle support on wet ground.

Browse the full composite toe boots range or step back to the master safety footwear collection to compare against steel toe boots, waterproof work boots, and electrical hazard boots. For metal-free picks ranked head to head, read the best composite toe work boots guide, and if you are still deciding whether you need a safety toe at all, see when do you need safety toe boots.

Frequently asked questions

Is the Carhartt CMF6366 metal-free?

Yes. It uses a non-metallic composite safety toe that meets ASTM F2413, so it is lighter than steel and clears metal detectors.

Is the CMF6366 waterproof?

No. It is a dry-site leather boot. Treat the oil-tanned upper with a boot waterproofing product if you need light water resistance.

What size should I order in the CMF6366?

It runs true to size for most wearers. If you have a wide forefoot, order a half size up because the composite toe box is slightly narrow.

How does the CMF6366 compare to a steel toe boot?

It meets the same ASTM F2413 impact and compression class but weighs less and does not conduct cold or set off metal detectors. Our steel toe vs composite toe guide breaks down the trade-offs.

Does the CMF6366 have an EH rating?

This model is rated for composite-toe impact and compression protection. For dedicated electrical hazard boots, see our EH boots collection.

Is the CMF6366 good for all-day standing?

Yes. The Rugged Flex outsole and cement construction keep it light and flexible; add a cushioned insole for concrete floors.

How long is the break-in period?

The oil-tanned leather breaks in relatively quickly, typically within a week of regular wear.

Will the CMF6366 pass through a metal detector?

Yes. The composite toe and non-metallic build are designed to clear metal detectors at airports and secure facilities.

What is the difference between the CMF6366 and the Carhartt Force HD?

The CMF6366 is a lighter dry-site leather boot; the Force HD adds an EH rating and slip-resistant outsole. Compare in our composite toe boots collection.

What insoles and socks pair well with the CMF6366?

A supportive cushioned insole and durable work socks. See our best work boot insoles guide.

Is the CMF6366 heavy?

No. Cement construction and the composite toe make it one of the lighter leather safety boots in this price range.

Where does the CMF6366 rank among composite toe boots?

It is our value leather pick. The best composite toe work boots guide ranks it against waterproof and premium options.

Ready to order?

Order your size above. For the hands-on breakdown see the Carhartt CMF6366 composite toe review, and to compare every metal-free option read the best composite toe work boots guide. You can also check the current price on Amazon — as an Amazon Associate, WC Safety earns from qualifying purchases.