Performance Fit - close and supportiveMoisture Management - natural moisture-wicking merinoThermoFit - returns to correct shape and size after every washOverfoot ventilation zones - improves airflow for heat and sweat managementFlat toe seam - reduce irritation and risk of blistersShockZones - supportive and cushioning for all-day comfortElasticated Arch and 3D-shaped heel cup - secures foot for extra supportMaterial: 42% Nylon/polyamide, 29% Merino wool, 19% Endurofil/polypropylene, 9% New wool, 1% LYCRA /elastaneSizes: Small - UK 3-5.5, Medium - UK 6-8.5, Large - UK 9-11.5, XL - UK 12+