Ordered this set due to the cooling effect. Their mission is accomplished. We love the feel of the sheets, but the fit is horrid. My wife and I are restless sleepers, their previous fit system on the mattress worked great. Held the corners well, even when we tossed and turned a lot. This fit system is terrible. Corners pop every night after the second night after a wash. The also unfortunate part is that Tempur doesn't offer extra pillow cases. You get two, that's it. The sheets feel great, just don't fit and stay fitted.