Closed cell foam insulation with R22 factor, and radiant barrier reflective insulation on both sides. Unique design (patent pending*) assembles for use quickly and breaks down rapidly for storage in a drawstring bag (included) and transport. Wind keepers (patent pending*) make the tire blankets resistant to being blown off the vehicle on windy days. High quality Ottertex waterproof outer layer in standard wine color.  Custom colors available at extra charge.  Contact us for color chart and pricing. Available in sizes to fit all popular 200 tread wear tires, including staggered wheel setups.