A good base layer is always important; ColdPruf(R) Men's Expedition Long Sleeve Crew 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 on the sleeved add protection and help prevent cold air from reaching your arms. The Men's Expedition Long Sleeve Crew is tagless and features flat seams so you don't have any discomfort or distractions while wearing this garment. FEATURES: Single Layer Engineering 100% Polyester Fleece - Heavyweight 10 oz. Rib Cuffs for added protection against cold Tagless and flat seams for added comfort Full Cut True Fit Comes in extended sizes Model: 85