Anti Fatigue Anti-Microbial Mats are made in USA from a 1/2 inch thick Nitrile foam. They are 4 feet wide and 6 feet long. They offer excellent Anti-Fatigue properties designed for indoor and outdoor. 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.