These are simply the best lifting shoes I have ever bought. They are very minimally supportive, but I feel like I get a better sense of my foot position in these. I have also gotten tons of compliments on them, even from some of the dudes at my gym! The tag does say to break them in, but that is because of the minimalist style of the shoe.  You will be using different muscles in different ways wearing these, but that is the point.  I am a physical therapy student, and I can say that you can safely wear these shoes provided that you don't have any serious foot problems and break them in over a 1 to 2 week period. They are awesome for CrossFit!