Meriwool Layers Men's Base Layer Lightweight Merino Wool Thermal Pants Size XL. Base Layer 100% Merino Wool Anti-bacterial & odor-resistant properties keep you dry and comfortable. Sourced directly from Australia, our Merino wool is pure, breathable, and lets you maintain the natural, outdoor feeling of being one with the Earth. In fact, the Merino wool clothing we create provides the proper warmth when the seasons start to change. Measurements included in pictures. Excellent preowned condition.