Whispercale Silk-Cotton King Duvet CoverTouch our luxury duvet covers and youll smile. The duvet cover in light weight silk cotton Whispercale is specially treated so the fibers swell and relax and the satin shine ebbs to a subtle glow and welcoming warmth. It feels like a handful of fresh rose petals. Ironed or not, these covers have an inviting, homey look, drape effortlessly and get better with use. There is also great attention to detail in design and construction. The fabric is pre