The Swix ASPIRE WOOL M men's long sleeve top is an ideal partner for various activities - running in cold weather, hiking / trekking, etc. It is completely made of natural materials. Wool insulates and regulates temperature, while tencel provides ventilation, cools, absorbs moisture. It is very soft to the touch. As wool lanolin has better anti-microbial / anti-odour properties, the panels in the armpit (upper parts) are made of 100% soft merino wool. This piece of clothing can accompany you for several days in a row, even during highly demanding activities.