I wear 10.5, ordered size 9-10 in Black, and the fit is good, very slipper-like (loose but not floppy). Color is much darker than photo, which I like. The sole does have heel rise similar to normal shoes, as noted in the product description. If you are looking for flat sandals, this isn't it. As far as warmth goes, the fabric is very warm BUT the fit is not conforming so they feel a bit drafty around the heel and top of the foot. I suppose this will vary from person to person, but I'd prefer a "furry" liner that conforms better. Also, being synthetic, they feel a bit humid on the foot, just like synthetic fabric socks. The best thing about these slippers is that they stay put when you are slipping them on or off, thanks to a grippy sole--no hands required. All in all: a good value but I will keep my eye out for something better.