Carhartt OR5471-M Quilt-Lined Loose Fit Washed Duck Insulated Pant Men's Large / Black

Warmth rating level 4 (highest), ankle to thigh zip, partial elastic waist:

Waist 40" - 44"
Rise 10.5"
Inseam 30"
Boot opening 19"

From the manufacturer:
Forget about the cold and focus on the job at hand in these men's insulated pants. They're made of classic duck canvas with lightweight synthetic insulation for warmth without added bulk. Ankle to thigh leg zips make for easy on and off over boots and layers. Multiple utility pockets give you space for tools and supplies.
Engineered for high warmth in severely cold conditions.
Carefully inspected and accurately described. Any flaws will be noted in the description.