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.