Our Organic Wool, is loosely felted into an almost 1/4" thick insulator pad. Sheep wool insulation is an outstanding insulator. For thousands of years sheep have been able to survive the elements using their wool coats to protect them from extreme cold and heat. ... Thermal conductivity is the ability for heat to pass from one side of a material through to the other. Our pure organic wool pads are the perfect way to relax and let your body breathe. Pure Wool underlays offer soft, springy, body conforming support, which eases painful pressure points giving you the wonderful, insulating qualities that only pure wool offers. Air flows through wool fibres to provide an air cushion – assists to relieve the pain of back ache, arthritis and rheumatism. Wool is naturally warm in the winter, cool in summer assisting with body temperature control and circulation. Hand Wash. However a wool underlay should seldom need cleaning, just air regularly to retain freshness. 100% pure Wool Felt almost 1/4" thick No chemical finishes