These soft folding mats are made of double-layered foam; a 1/2” firm polyethylene foam bottom with 1 1/2” soft polyurethane foam top. The new, thicker 16 oz. vinyl cover is flame resistant & mildew proof and is constructed in a way that has the top surface stronger than 18 oz. vinyl. The mats are lightweight and fold into 2’ panels for easy storage and handling. 1 1/2" wide Velcro sewn on both ends. Specially designed for elementary use. Please specify color(s) in comment section of ordering page. Choose from 15 colors; white, gray, black, yellow, tan, orange, red, maroon, kelly green, forest green, sky blue, champion blue, royal blue, navy blue, and purple. If no color is specified royal blue will be shipped. Allow 2-3 weeks for delivery. Not designed for dismounts from apparatus. Meets New ASTM Standards and CA Prop 65 Warning for Hazardous Materials. Allow 4-6 weeks for delivery. Not designed for dismounts for apparatus. An explanation of vinyl cover thickness: The thickness of the vinyl cover is measured in ounces. “16 oz vinyl means that every square yard of material weighs 16 ounces. Made in the USA.