Royal Hotel King/Cal-King Gray Silky Soft Duvet Covers 100% Viscose from Bamboo Duvet Cover Sets 100 percent viscose from Bamboo Duvet Covers. 300TC and the softest fabric in the world, noticeably softer than cotton Extremely comfortable in all temperatures. Perfect for people with allergies & chemical sensitivity Bamboo is highly resistant to dust mites and grown without pesticides, Amazingly soft similar to cashmere of silk King/Cal-King set includes 1 Duvet Cover 106X92" w/ Button Closure, and 2 King pillow shams 20X36" Duvet Covers slip over your existing comforter creating new luxury look.