The Mountain Warehouse Men's Merino II Base Layer Top is a performance-oriented garment, crafted from a blend of 80% Merino Wool and 20% Polyester. This top comes in a simple, elegant design. It features a half zip fastening for versatility and a high-neck for added warmth. The sleeves are long to provide optimal coverage. The fabric technology includes anti-bacterial properties to prevent odor buildup, is breathable for comfort during intense activities, lightweight for easy layering, and boasts moisture-wicking capabilities to keep you dry. Sizes range from XXS (33 inches) to 4XL (56 inches), catering to a wide variety of fits.