Workers-Delight Anti-Fatigue Mats feature revolutionary Zedlan™ foam, which is fused to a supportive Marbelized Rubber™ top to give you greater cushioning and “bounce” than traditional vinyl foam mats. Place in wet or dry work areas or where chemicals are present. Rubber top with Zedlan™ foam base. 9/16" thick. Durable and slip-resistant, these mats are extremely resilient in cold temperatures and resist most chemicals and common fluids. Safety beveled edges on all four sides. Made in USA.