Medium thickness in T3 technology with cushioning in the sole for any level of trekking except when it's very hot. This model offers an excellent balance between thermal insulation and breathability that you will appreciate on long routes.,Selective Layering System is a technology that allows us to combine different numbers of layers in different areas of the same sock, as required by the activity.,Exclusive technology with three differentiated layers of yarn, allowing for peak performance from each type of yarn and providing maximum benefits for athletes.,Due to the long length and short diameter of the fiber, Merino sheep's wool creates a softer yarn that is softer to the touch than wool from other species of sheep. The fiber's core is hydrophilic and breathable. It retains heat even when wet.,Polyester yarn developed by PrimaLoft. It is a soft, thermally insulating, hydrophobic fiber that wicks away and does not absorb moisture. It is currently made with 70% of its contents coming from recycled resources like plastic bottles.