This 3/4-inch thick premium hybrid flat exercise mat uses XLPE for a crush-resistant core and PE for the top and bottom for durability. This combination provides the most comfort with the maximum durability in a school gym or other commercial setting. The cross-linked PE center layer has the ability to crush and bounce back. The outer layer of tough PE has a thinner, but higher density material that is easy to keep clean and protects the softer form in the center. This durable flat exercise mat is designed to provide you with years of service. The dimensions of this premium flat exercise mat are 3/4" x 4' x 2'