Wow, these are seriously THE MOST COMFORTABLE slippers I've ever worn.  The sheep's skin lining on the interior gently conforms to and comforts the foot from all sides in a warm, springy, hug,  Never felt anything like it..  Fit ran true for me, 11W, which I often wear in other shoes (10.5-11.5W depending on brand).  Love the waterproof sole as well, makes it easy to step outside for a bit if necessary.  Grip is also very good, i.e., no slipping.  Easy to get on, and stay comfortably on without flopping around. Love the style and color (Birch) as well, they look nice, not silly or so casual as to be ugly.  Finally, and importantly, while wonderfully warm in the cool or cold without getting sweaty, they are also not bad in the summer in air conditioning, i.e, multi-season.  I'll likely not wear then as much in the hottest part of the summer even with the AC, but was surprised and pleased at how flexible they are in terms of temperature range in which they are comfortable.  HIGHLY recommended!