Bamboo charcoal is elaborately burn-made from old bamboo by heating under high temperature after more than 20days. There are about 250 grams charcoal in every square meter bamboo. Dues to the high density and porous structure, bamboo charcoal have very good absorption ability. It can generate anions which can make you feel relaxed and stable in mind. This product will keep your feet healthy, it can kill the germs can dermatophytosis. Our bamboo charcoal insole can be used circularly by washing and drying in the sun. We believe it will be your best choice for health. if you are interested in our products, please feel free to contact me.