The Mountain Warehouse Men's Merino Wool Thermal Top is a versatile piece designed for comfort and warmth. Crafted with 80% Merino Wool and 20% Polyester, it offers a plain design that seamlessly blends with any outdoor ensemble. This long-sleeved round neck top boasts several advanced fabric technologies. It is anti-odor and antibacterial, ensuring freshness even after prolonged use. The breathable fabric ensures optimal temperature regulation, while its lightweight design makes it ideal for layering during colder climates. The Isotherm technology maintains the garment's warmth even when wet, a crucial feature for outdoor adventures. Its moisture-wicking properties help keep you dry by quickly transferring sweat away from your skin to the surface of the fabric where it evaporates easily. Additionally, this top dries quickly, making it perfect for activities that demand constant movement and rapid transitions. The sizes range from XXS (33 inches) to 4XL (56 inches), catering to a wide range of fits.