Anti Fatigue Anti-Microbial Mats are made in USA from a 1/2 inch thick Nitrile foam. They offer excellent Anti-Fatigue properties designed for indoor and outdoor. They are 3 feet wide and 4 feet long. The Anti-microbial treatment prevents odors and degradation of the mat. Their beveled edges provide a safe transition from floor to mat. They are resistant to chemical, grease and oil. These Anti Fatigue Anti-Microbial Mats are light weight and easy to clean.