Utilising proprietary 100% waterproof, breathable and windproof StretchDry technology this sock is perfect for a multitude of activities and conditions.   Totally waterproof, breathable and windproof Merino wool lining for moisture control & comfort Elasticated ankle & insteps offer support and a comfortable fit Mid weight sock offering the perfect balance of warmth and breathability    MATERIAL   Outer Lining: 91% Nylon, 9% Elastane Membrane: Hydrophilic Membrane Inner Lining: 35% Merino Wool, 34% Acrylic, 28% Polyester, 2% Elastodiene, 1% Elastane SIZE GUIDE   To ensure you purchase the perfect fit sock or overshoe, please ensure you pick the same size in relation to your shoe.  For example if you are a size 7 shoe (UK) you will require a medium sock or overshoe