Genuine Vegetable-Tanned Leather:Unlike other production methods, the leather of Handarte Insoles is processed with Chestnut and Quebracho wood powder for a month.Active Carbon Layer:The leather absorbs sweat and traps it in the active carbon part, preventing bacterial growth. Thus, it prevents foot odor in the feet.Sweat Absorbent: to the bigger pore size on the goat skin and vegetable tanning method, its pores can absorb sweat at . Sweat absorption occurs instantly, and you do not feel wetness on your feet.Foot Odor-Eater:Vegetable tannins and dryness on the feet, to the sweat-absorbent feature, prevent bacterial growth on the feet. Recyclable & Environmental Product:The package and the product are environmentally recyclable.How to use Handarte Insoles:For comfort nubuck leather foot-odor eater insoles, insert them into your footwear.Renew Handarte Insoles:As the color darkens, it is understood that the pores are completely filled and do not work very well.