Duofold by Champion Men's Originals Wool-Blend Thermal Pants_Olive Heather 2-LAYER 6.3-OZ. FABRIC: 100% cotton inside; 65% cotton/25% Merino wool/10% nylon outside All-in-one slip comfortably smooths out all your trouble areas. 6.3-oz. fabric has two non-bulky layers. Outer layer contains Merino wool for natural insulation. Inner layer is pure cotton, for softness next to your skin. Together, both layers trap air to create a warm thermal barrier.