Champion Duofold Originals Wool-Blend Men's Thermal Shirt 2-LAYER 6.3-OZ. FABRIC: 100% cotton inside; 65% cotton/25% Merino wool/10% nylon outside Imported 2-LAYER 6.3-OZ. FABRIC: 1% cotton inside; 65% cotton/25% Merino wool/1% nylon outside 2-LAYER 6.3-OZ. FABRIC: 1% cotton inside; 65% cotton/25% Merino wool/1% nylon outside Close-to-body fit allows for easy layering Details include tag-free banded crewneck and non-chafe flat-locked seams. Great on its own or as base-layer thermal underwear.