SELECTED MATERIAL - These womens hiking crew socks made of 70% MERINO WOOL, 23% polyester, 5% spandex , 2% nylon.They can keep the temperature and warm up your feet in cold weather. TWO SIZE OPTIONS - DYW merino wool hiking socks have 2 sizes as options, Medium & Large .Medium Size fits for US women’s shoe size 5.5-10.Large Size fits for US women’s shoe size 10-13. A package includes 5 pairs womens warm socks. ELASTICITY - These warm hiking socks for womens have high elasticity and arch stripe,which can enhance the blood moving ,relieve symptoms varicose and keep socks stable.They can greatly improve your comfort in hiking , running , walking , climbing , trekking or everyday wear. FLA.13 plus, extended size, Merino wool, winter, socks, knit, comfy