I was leary of purchasing a sneaker online without first trying them on, but I couldn't find them anywhere around where I lived, so figured I'd just return them if I wasn't satisfied with how they fit.  I was pleasantly surprised that the fit was perfectly comfortable and much better than the Asics brand I had been using for the last several years.  I purchased them for the zumba classes I attend and was very happy with my ability to dance my little toes off without sliding forward in the sneaker, which had been the problem I was having with my Asics!  I bought the same size I used in Asics, which is a size larger than my normal shoe size and they are great.