Thin weight mid length sock for a multitude of activities, where maximum breathability and calf length coverage are required. Totally waterproof, breathable and windproof Merino wool lining for moisture control & comfort Elasticated ankle & insteps offer support and a comfortable fit     MATERIAL   Outer Lining: 87% Nylon, 13% Elastane Lining:  51% Merino Wool, 30% Polyester, 15% Acrylic, 3% 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.