Our duvets are encased in cotton and filled with 100% pure mulberry silk floss. They're hypo-allergenic and packed with skin and respitory benefits. Silk is a natural protein making it far less hospitable to dust mites and bacteria. It is the perfect duvet for allergy sufferers. Research has found that because silk is free of chemicals it is extremely effective in fighting asthma and eczema, as well as many other skin and health conditions. The beautiful silk layers allow the duvet to breathe while helping maintain a comfortable temperature. Our duvets are a welcome relief for menopausal women who experience night sweats, allowing for a restful sleep.