Carhartt Men's B111 Flannel Lined Washed Duck Loose Fit (Style 6MFH)

Our review of the Carhartt Men's B111 Flannel Lined Washed Duck Loose Fit Pant finds it best for hands-on workers and anyone who needs a rugged, warm pant for cold weather. The single biggest reason to buy is the combination of heavyweight 12-ounce cotton duck with a 3.8-ounce cotton flannel lining, which delivers reliable insulation without feeling bulky. The fit sits slightly above the waist with a loose, generous cut through the seat and thigh, so it will appeal to users who prioritize mobility and the ability to layer over work clothes.

Key Features

• Heavyweight duck: 12-ounce, 100% ring-spun cotton duck provides abrasion resistance and long-term durability on the job.
• Flannel lining: The 3.8-ounce, 100% cotton flannel lining adds comfortable warmth while remaining breathable for extended wear.
• Work-ready pockets: Multiple tool and utility pockets plus a hammer loop keep gear accessible and organized during a workday.
• Generous fit: Sits slightly above the waist with a roomy seat and thigh to allow free movement and layering over base garments.
• Boot cut leg: 19-in leg openings are sized to fit over work boots, making these pants practical for outdoor or construction tasks.

Who It's For

The B111 is aimed at tradespeople, outdoor workers, and anyone who needs a tough pant for cold conditions; the heavy duck canvas and flannel lining are practical for winter jobs, snow, and long hours outdoors. The roomy cut suits those who wear work belts or layer thermal leggings underneath.

Those who prefer a slim, fashion-fit pant or need a lightweight summer work pant should look elsewhere; the 12-ounce duck and flannel lining make these too warm for hot weather and the loose, boot-cut silhouette is not designed for tailored styling.

Pros & Cons

Pros

• Very warm for winter use thanks to the full cotton flannel lining.
• Durable construction from heavyweight ring-spun cotton duck holds up to tough conditions.
• Functional pocket layout and hammer loop keep tools handy on the job.
• Comfortable, generous fit that allows for freedom of movement and layering.

Cons

• Fit and length receive mixed feedback; sizing can feel inconsistent so buyers may need to try sizes to find the best match.
• Heavyweight construction can be too warm for indoor or summer work environments.

Specifications

Fabric	12-ounce, 100% ring-spun cotton duck
Lining	3.8-ounce, 100% cotton flannel
Fit	Loose fit; sits slightly above the waist, generous through seat and thigh
Leg style	Boot Cut (19-in leg opening to fit over boots)
Pockets	Multiple tool and utility pockets with hammer loop and reinforced back pockets
Use case	Workwear, cold-weather outdoor use

Our Verdict

The Carhartt B111 flannel lined washed duck pant is a practical buy for anyone who needs a warm, hardwearing work pant that accommodates tools and boots. Its heavyweight duck and flannel lining offer good value for winter work, though shoppers should check sizing because the loose, boot-cut fit can run differently across users.

Frequently Asked Questions

Are these pants warm enough for winter?
Yes. The 3.8-ounce cotton flannel lining combined with 12-ounce duck provides substantial insulation for cold-weather work.

Will the leg openings fit over work boots?
Yes. The 19-in leg openings are sized to fit over standard work boots and allow easy movement.

Do they run true to size?
Fit feedback is mixed; the cut is generous through the seat and thigh, so some users may need to size down or try multiple sizes for the preferred length and waist fit.