This Duofold Varitherm Expedition-Weight Long-Leg Men's Men's Base-Layer Ankle Length Bottom features a sleek expedition-weight 4-way stretch fabric for a sleek fit and greater freedom of movement. Excellent moisture management - quick drying. Odor resistant fabric. Tagless. Flatlock seams to help avoid irritation. Bi-Ply fabric traps your body's heat between two thermal layers for maximum warmth.