The Mulberry Silk Duvets are filled with 100% luxurious long strand silk, proving the ultimate in sleeping comfort. The silk is stretched by hand into place then box stitched into a 230 thread count cotton cover. In choosing a long strand silk fill, this prevents any shifting, matting or bulking. This will also avoid any cold spots throughout the duvet. The Mulberry Silk Crib Duvet is lightweight, and drapes to the contours of the body. Silk as a filament is naturally non-allergenic making it a perfect choice for those with allergies and sensitive skin. Due to the silk’s reflective and breathable properties, it enables the sleeper to remain cool in the summer and warm in the winter.