These down-filled pants are designed for the harsh winter. They are filled with 650-fill-power duck down for superior warmth. The checkered pattern ensures even distribution of down. A 3M liner and graphene lining provide extra warmth and prevent static electricity. Waterproof, oil-proof, and stain-resistant, with extra-thick padding at the knees and hips to combat extreme cold. Elasticated cuffs provide wind protection, and the pants can be tucked away for a snug fit.