Performance Fit - close and supportiveMoisture Management - natural moisture-wicking merino ThermoFit - returns to correct shape and size after every washOverfoot ventilation zones - improves airflow for heat and sweat managementForward Flex - prevents \'bunching\' under the shoe tongue T2 AntiShock Cushioning - offers an additional level of impact protectionFlat 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: 59% Nylon/Polyamide, 39% merino wool, 2% LYCRA/ElastaneSizes: Small - UK 3-5.5, Medium - UK 6-8.5, Large - UK 9-11.5, XL - UK 12+