I'm a podiatrist. I bought this shoe based on the good reviews I read. I want to start by saying that Saucony makes amazing running shoes. However, the Endorphin Speed 2 was a size and a half smaller. The reason I know this is because I ran with him and ended up with sore toes and heels. I also wear it on my girlfriend's shoes who are an 8 for women and I am an 8.5 for men. It was the same size as her current women's shoe which is a size 8. She loves the shoes but unfortunately I didn't get what I was hoping for.