Patented technology for dry skin on the feet. Soft easy-stretch for a comfortable fit - hOW TO USE: DermaSox M/L (sizes 9-13) are treated to last for 30 days per pair, 60 days full treatment per pack. Simply wear straight from the pack. Treatment is only released on friction through wearing the socks. DermaSox can be worn as normal footwear after treatment period. Filtering Nano-Bamboo charcoal fibre areas outlined in green are designed with extra fabric for more intense delivery, where needed the most