Bio Sleep Concept Organic Wool 3-Inch Eastern King Size Mattress Topper 100% Cotton Made in US Natural and chemical-free 1 Year Limited Manufacturer Warranty Made in USA Care instructions: sun and air seasonally to revitalize the wool Wool is the ideal bio and natural fill for toppers Wool is naturally hypoallergenic , dust mites and mildew resistant This mattress topper is environmentally safe and features an organic cotton cover filled with organic pure wool