Provide your students with the greatest shock absorbency during tumbling or high-impact activities. These mats are constructed of 1-3/8" crosslink polyethylene foam, covered with an extra strong 18-oz. vinyl featuring double reinforced nylon-sewn seams. Since these are the lightest mats per square foot, they are easy to set up and put away. Link mats together using the VELCRO® brand sides. These items ship direct from the factory. Royal/White. VELCRO® is a registered trademark of Velcro Industries B.V.