Bridgedale Base Layer Thermal Liner Boot Socks - Unisex\'s Unisex style, designed to be worn for warmth and comfort these thermal liners with Endurofil will help keep feet warm, dry and protected. Endurofil has the lowest thermal conductivity of any yarn and worn next to the skin helps the retain heat generated by your feet. They will also transport moisture generated quickly away from the skin out to the main sock where it can evaporate keeping feet dry and comfortable. Extremely quick drying they\'ll be ready and waiting in the morning after a quick wash. The Flat Toe Seam minimises bulk that could cause irritation and built on a structure of Lycra®, allows our Thermo Fit process to ensure the sock returns to its original shape and size after every wash. Features: Sock Height: Boot / Crew Performance Fit Moisture Management Flat toe seam Fibre Content:  79% Endurofil® / polypropylene 17%Nylon / polyamide 4% LYCRA® / elastane Size Guide: Please see this guide to get the correct sizing for your socks. UNISEX 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+