These are indeed unbelievably silky and luxurious, however with a King size duvet cover they were TOO silky, and even with the corner ties (excellent feature) the duvet was slipping and sliding and we were getting all tangled. Took advantage of the 30-night trial and returned for a refund, absolutely no trouble at all. I have ordered sheets and pillowcases, would consider the duvet cover on a single or if I didn't have to share with a spouse, as it really is lovely to sleep in.