A good base layer is always important; ColdPruf(R) Men's Expedition Pant is ideal for keeping warm in extreme cold. The material is a heavyweight Polyester Fleece meant to keep as much heat in as possible. Rib Cuffs around the bottom add protection and help prevent cold air from reaching your legs. The Men's Expedition Pant is tagless and features flat seams so you don't have any discomfort or distractions while wearing this garment. FEATURES: 100% Polyester Fleece - Heavyweight 10 oz. Comfort Waistband Rib Cuffs for added protection against cold Tagless and Flat seams for added comfort Full Cut True Fit Comes in extended sizes Model: 85B