A washable sheepskin with the wool shorn to a length of 1 inch (2.5cm). A natural product that breaths and allows continuous air circulation to aid in the prevention of bed sores. Warm in winter, cool in summer. Comfort for someone you love. Can be used over or under a sheet. This is the same high quality product we supply to hospitals and clinics for use in lining body casts. Synthetics don't compare.