30" x 24", Self Warming Pet Bed, Utilizing The Same Technology That Heats Space Blankets Pet Bed Is Lined With A Layer Of Material That Generates Warmth By Reflecting A Pets Own Body Heat, Constructed From Faux Lambs Wool Plush & Corduroy Fabrics For Added Comfort & Warmth Safe & Hassle-Free, Helps Warm Pets Without Electricity.