I've worn dozens of tennis shoes in my life and none fit as well as this one. These tennis shoes don't need to be broken in, they are soft, grippy and very comfortable. I have my 5th pair of Uberaonics and this 4th iteration is the best. Sizing wise I would run them a bit small, I usually wear a size 9 in all other adidas shoes but ended up at a 9.5 in these. and the fit was perfect.