The lunch boxes are made from recycling rice husks. Why rice husks? Rice is harvested in mass quantities throughout the world. When processed, the sheer volume of husks causes issues as how to properly dispose of it as rice husks, if not ethically discarded, can be a biohazard. Rice husks are a by-product of agricultural industries and can be harmful to the environment if not disposed of correctly. That's why these twin wall insulated travel cups are so great, Huski uses the leftover rice husks from farming so that farmers don't have to try to dispose of the husks in other ways. Huski have searched for the most environmentally way to bind the rice husk in their lunchboxes and cups.