I just barely got these in the mail and yes, its true, go a whole size up! I always wear a size 9 but I listened to all the reviews and went to 10 and they feel great. The fur that lines the top goes throughout the whole inside, so very snuggly. The contours on the product image make it look very slender around the ankle, but remember the fluff makes it not quite as slender as in the image.