I am normally a size 7.5 and have a pair of regular Jasper shoes that are size 8 and just fit. Having this experience, I ordered a size 8 when the Keen Customer service representative indicated that Jasper Rocks were running true to size. When they arrived and I put them on my feet they were too tight so I returned them and ordered an 8.5. The 8.5 was even tighter on my foot then the size 8. I've given up on ordering Keen's by mail and will only purchase them from a brick and mortar store in the future.