These shoes are made of a specially formulated material that is soft, lightweight, and flexible for all day comfort. These shoes run true to size but we recommend rounding up if you are between sizes. Recyclable Non Marking Slip Resistant Water Resistant Contoured Footbed Cleaning Instructions: These shoes are easy to clean in a variety of ways! The recyclable material is easy to wear and clean—just wipe your shoes down with a general cleaning wipe, or run them in the washing machine (air dry) or dishwasher.