I doubt these slippers are 80% cotton as the description reads. They make my feet perspire without socks. With socks, they fit like a dream and are very cushioned, therefore comfortable to walk on. Always purchase Isotoner slippers a size larger. They do shrink when they're washed a few times, but they last for years and are well worth the price. I would never buy another brand of slippers now that I know how this brand feels.