Designed to be versatile, soft and comfortable, this men's long sleeve zip neck shirt is made with 100% Merino wool, an annually renewable fiber that naturally resists odors and regulates body temperature - these winter shirts for men will keep you warm when it's cold and cool when it's warm! Our wool base layer for men's layering has a snug, close-to-body fit for low-bulk layers, and it will help manage moisture. Plus, these under clothes for cold weather have rib fabric and forward set side seams that provide amazing stretch and comfort, and they are breathable to keep your skin comfortable all day. At Icebreaker Merino, we believe nature has the solutions, and we pride ourselves on providing natural performance alternatives to synthetic-based apparel to create a healthier, more sustainable future. Our Merino wool thermal underwear are machine washable in warm water with like colors. They should be line dried in shade, and they are dry cleanable. Product Details: (1) Half-Zip Long Sleeve Top Materials: 100% Merino wool, Metal zip