The Sensor MERINOWOOL M functional boxers are made of a unique construction combining polyester on the inside and high quality merino wool from New Zealand. The main advantage of this combination is that the polyester accelerates the transport of sweat to the outer wool layer that has unique anti-odour and thermal regulation properties. The thin inner polyester eliminates the itchy feeling for people sensitive to wool. Ideal for sports in extreme climatic conditions such as high altitude hiking, ski mountaineering, rock climbing.