Waterproof, breathable, windproof mid-calf sockFlexible and resistant (4-way Stretch technology)Warm, breathable, good perspiration management thanks to the unique properties of merino woolThermal index: 4/5Composition: 98% polyamide outer, 2% elastane. Intermediate layer Porelle membrane (polyurethane). Interior 38% merino wool, 38% acrylic, 24% polyamide