Sanitary anti-fatigue mat is designed for safety, comfort, and performance. Drainage holes have clear, cylindrical walls with no ledges to trap food particles or harbor bacteria. Cleans up quickly… [Read more] and completely. Your feet stay dry and comfortable on slip resistant surface of elevated ribs. Use in wet or dry areas. 7/8" thick 100% natural rubber. 1- year conditional warranty. Black. WARNING: This product can expose you to chemicals which are known to the state of California to cause cancer, birth defects, and/or other reproductive harm.