Aspen Self Warming Pet Lounge Bed, Utilizing The Same Technology That Heats Space Blankets, Lined With A Layer Of Material That Generates Warmth By Reflecting A Pet's Own Body Heat, Constructed From Faux Lambs Wool Plush & Corduroy Fabrics For Added Comfort & Warmth, Features Same Heat Reflecting Technology Used In Mylar Space Blankets, Safe & Hassle Free, Helps Warm Pets Without Electricity, Made From Faux Lambs Wool Plush & Wide Wale Corduroy With A Non-Skid Bottom.