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. 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.