The men's longsleeved Tshirt from our Merino thermal underwear collection is a great functional piece for all conditions. You can use it all year round for everyday wear and for various outdoor activities in nature. Merino is a natural thermo material made of sheep wool. It is also suitable for allergy sufferers and has a lot of great properties. Maintains body temperature Perfectly breathable Perfectly wicks moisture away from the body Natural antibacterial property eliminates odor