Crepe rubber soles can become firm when stored at low temperatures. We recommend storing your Duckfeet in an environment between 66–76 °F. If the soles become hard, you can place the shoes inside for a period of time until the crepe rubber is soft again.
Do not leave in direct sunlight. Crepe will soften and become tacky.
Since the natural crepe is untreated, avoid contact with solvents because such substances may dissolve the rubber.