Question: do saucony jazz run small?
Answer: I know many people say they run true-to-size, but, for me, they were at least 1/2 size small. And, in fact, when I put the Saucony Jazz 12s next to the Nike Relentless 11 1/2s, the shoes were identical in size. But you can easily go larger in the Jazz, as they somehow make your feet look smaller.