Bridgedale Hike MW Merino Performance Boot Socks - Men\'s All year round sock for outdoor enthusiast. Designed to ensure dry, warm and comfortable feet. Originally named the Trekker, this sock changed the expectations of a hiking sock forever. Engineered advanced zonal padding system for support and comfort this is the ultimate sock for long or multiday expeditions. Merino Performance Fusion Technology provides resilient padding, balanced insulation, moisture wicking and outstanding durability for all day comfort. The Performance Fit is close and supportive and won\'t slip down or bunch in your footwear. The Flat Toe Seam minimises bulk that could cause irritation in the toe box and the sock is kept securely in place with an Elasticated Arch and 3D-shaped heel cup. Built on a structure of Lycra® and set by our Thermo Fit process ensures the sock returns to its original shape and size after every wash. Tested and loved by 1000\'s of walkers, hikers and explorers the Trekker has been copied but never bettered. Features: Sock Height: Boot / Crew Perfomance Fit Moisture Management ThermoFit Foward Flex Flat toe seam ShockZones Y-Heel Fibre Content:  26% New Wool 18% Merino Wool 38% Nylon / polyamide 17% Endurofil™/ polypropylene 1% LYCRA® / elastane Size Guide: Please see this guide to get the correct sizing for your socks. UNISEX / MEN\'S Sock Size UK Europe USA Cm / Inches Small 3-5.5 36-39 4-6.5 22.0-24.5 / 8.66-9.64 Medium 6-8.5 40-43 7-9.5 24.5-27.0 / 9.64-10.63 Large 9-11.5 44-47 10-12.5 27.0-29.0 / 10.63-11.42 X-Large 12+ 48+ 13+ 29.0+ / 11.42+