All Ohm-Stat foot grounders can be adjusted to fit the user. The Ohm-Stat Heel Grounder line has four unique styles to fit a wide variety of men's and women's shoes, boots, safety shoes, loafers, tennis shoes, and running shoes. They are easy cleaned with mild detergent and water. To assure that a continuous path to ground is maintained, the user should wear the ESD footwear on both feet. A heel grounder should be used on a floor surface with a resistivity of less than 1010 Ohms/sq.