The fitted sheet does not stay on the corners. The elastic is not very tight. When we rise the bed up for the head or foot the corner comes off the mattress when you lower it back down. I had order 4 sets because we have a split king adjustable bed so the mattress takes a twin xl fitted. The 1 set that I order the 1 set had a stain on it when I open the package. I have not open the other sets yet.they are warm, but slick. Not real fond of the microfiber material.