First of all, I have always worn a size 7 shoe.  I can understand sometimes having to order a half size up but an entire shoe size up is ridiculous.  How in the world is that even possible to make shoes that far off in size?  I did indeed order the 8s and they mostly fit but I had to quit the treadmill because they were making my heel hurt and that was the reason for purchasing them in the first place.  I need a pair of shoes that do NOT make my heels hurt.  I did also buy a pair of W3840 but in a size 7.5 per reviews and that pair seem to be ok.  Overall I'm not ecstatic about this brand of shoe but I see that others are.  So if you are buying this particular shoe, definitely order an entire size up.  I returned these.