HIGH QUALITY SMART DESIGN: We use 100% Oeko-Tex certified & hypoallergenic cotton for breathability and balanced comfort. EASY TO USE: Just tie your weighted blanket to the 8 hoops of this cover and you??re good to go. MACHINE WASHABLE: Our covers are machine washable for easy care. SOLD SEPARATELY: The weighted blanket and duvet cover are not sold as a set. ZIPPER CLOSURE: Our zipper closure makes the machine washable duvet cover easy to remove and wash.