Haflinger wool slippers are the best I've ever had and I've worn many slippers over the years. Because they are wool, they keep your feet warm yet allow them to "breathe" which in turn keeps your feet from sweating. Beyond that, they are very, very comfortable. My only complaint, if you can call it that, is that they don't last forever! I am able to wear mine from September through May for about 3 or 4 seasons before they are worn out and need to be tossed. But they're still worth it!