Sleep & Beyond 39 by 81-Inch Washable Wool Mattress Pad, Twin X-Large, Natural Cover: 100% Natural Cotton Percale/ Fill: 100% Shropshire Wool Imported Washable wool mattress pad for full night's rejuvenating sleep Keeps you warm in winter and cool in summer; Encased in unbleached natural cotton percale fabric, 270TC Shropshire wool needs to be cleaned less frequently than other fibers; Washable cover is recommended