The Assos Ultraz Winter socks have what you need, featuring a breathable design with three-layer insulation. The yarns contain merino wool with natural odour resistance. This material also provides warmth when wet, in case rain or road spray manages to penetrate your winter overshoes. The 18 cm high shaft helps prevent gaps between the different layers.Great insulation. Great breathability. These characteristics are essential for maintaining comfort in the coldest winter weather: both contribute to retaining heat and eliminate the risk of internal moisture creating a cold and sticky environment, which can lead to a chilling, piercing sensation so uncomfortable that it forces you to abandon the ride.The cut of Assos garments has been designed based on the position on the bicycle. Some Assos garments have been particularly conceived for users with an athletic build. The Assos cuts are anatomical, according to the A.E.P.