I am just getting the voltaic running shoe broke in to my foot. Initially the shoe appeared to be a bit snug even tho I purchased a half size up. The design engineers for all athletic shoe MFG'S have a serious problem in making shoes that are wide enough. I don't understand why this is, unless it is a marketing scheme that is being used on consumers. However this puma after serveral days of wear is fitting very nicely for a running shoe. I normally don't purchase running shoes I usually go for cross trainig high tops but I will be doing some jogging when spring comes and I wanted a light weight shoe. I think I have found the right Brand in Puma. I will probably look at the Puma Tazon 5 next. Puma does make some very attractive shoes, I am very pleased with my purchase I hope it is a shoe that will with stand the test of time.