NO SHOW STYLE – The low cut design ensure that the socks hidden in the shoes, which is a must sometimes NON SLIP – Silicone non-slip strips on each socks ensures that the sock fits the contours of the foot so perfectly and WILL NOT SLIDE DOWN! COPPER INFUSED – 65% Combed Cotton/35% Copper Yarn. The copper ions in the yarn can produce a natural protected area, reducing 99% of the sweat, keep fresh in the shoes. The blended copper ion fabric is very soft, smooth and dry fit. It helps the embarrassing feet. DRY FIT – Provides soothes aching muscles, while the fabric maintains airflow so your feet stay fresh; Powerful dry fit material with mesh venting blend keeps your feet cool and improve your feet performance, which is super comfortable for casual wear and sports activities. SIZE – Women fits for shoe size 5-8 US. Men fits for shoe size 7-10 US.