Compared to the basic Midweight model, this Plus model has a thicker knit throughout the entire sockthe added insulation and higher merino wool content make this a warm option. A great choice when you want to invest in quality for skiing and snowboarding. - Shaft length from above the heel: 33 cm - 34% merino wool, 33% Endurofil polypropylene, 32% nylon, 1% Lycra - Sizes: S = 36-39, M = 40-43, L = 44-47, XL = 48+ - Calf knit is extra stretchy - 5-year warranty for material and manufacturing defects For long-time Bridgedale fans: this sock model was previously known as Mountain.