Harbinger Ribbed Durafoam Mat Anti-Microbial 5/8 Blue 1 unit is the perfect foundation for Yoga, stretching, ab workouts, and other exercises and is made with an innovative foam that permanently resists bacteria. This useful mat is easy to clean, rolls up for easy storage, and has a removable strap for convenient carrying. This mat makes all floor exercises more comfortable and safe. It is double thick to prevent back pain during crunches and sit-ups. It grips the floor with special non-skid ridges and is moisture resistant, which makes it safer to use and simple to clean.