I absolutely love these slippers! They are perfect for the rural environment I live in and are comfy & warm. They are also quite cute. I ordered the charcoal color & find that this color goes nicely with just about any jammies...or even jeans (around the house). The quality is great compared with other slippers I've purchased in the past.  The sole is quite firm and gives nice support for those that have foot problems or are on hard floors. I ordered a 1/2 size bigger than I usually wear & they fit perfect (even with socks). If you like to wear THICK socks, I'd go for a size bigger for some "toe room". I didn't notice the back part rolling up, since the size is right. If you order them "too small" this would indeed be an issue. If your feet are WIDE, I'd definitely go for a size bigger. Highly recommended slippers!