The Swix ASPIRE WOOL W women's long sleeve top is an ideal partner for various activities - running in cold weather, hiking / trekking, etc. It is made of natural materials only. Wool insulates and regulates temperature, while tencel provides ventilation, cools, absorbs moisture. The material 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.