Made with lightweight, durable cross-linked polyethylene, Therm-A-Rests RidgeRest Classic Sleeping Pads are perfect for backcountry excursions. Supportive peaks keep you from developing stiffness, while heat-trapping valleys ensure the cold ground doesnt get the upper hand. Made in USA. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Sleeping Pads.