SUNNY NOMADO Mixed yarn switching socksCotton & Hemp Made in Japan Linen has tiny gaps in its fibers, allowing air and moisture to pass through easily. This makes it highly breathable and less likely to trap sweat or moisture. The reason why linen clothing and underwear stay dry and comfortable even in hot weather is due to the structure of the material itself. Hemp fibers have a stiff, resilient surface, and a unique "crisp" feel when they touch the skin. This is due to the unique