BOBR Knee high socks – HEAVY DUTY elastic with silver and and one year walk through guarantee are designed to protect calfs in all day work and moving when sweat is produced. These two layer, year-round knee high socks are made of polypropylene - a hollow thread with silver. In the upper layer it has a very quality cotton which absorbs body sweat. Drainage channel ventilates your foot and the reinforced bottom part of the sock guarantees high resistance against the wind and soft walking.The calf part is highly elastic, for downward movement of the over the knee socks. The loose hem ensures perfect blood circulation of your foot and the silver, which is knitted into the knee high sock, acts antibacterially. Reinforced hems over the instep and ankle hold the sock in place in loose footwear.