Reusable menstrual pads are a reusable alternative to disposable sanitary napkins used by women when they are menstruating (having their period). They are made of cloth as opposed to plastic, and are washed and dried between each use. Reusable menstrual pads can be made from new materials or from old materials such as old pillow cases, sheets and towels. There are many different designs of reusable menstrual pads; most designs include a cotton "case" and a towel "insert".