Verdict: Asics runs about a full US size big in men's sizes and requires sizing down from most brands. Women's models run true to size or half-a-size big. To make things less complicated, we strongly advise measuring your foot length first.

Do Asics run larger than Nike?

In general, Asics running shoes run a bit smaller and tighter than Nike running shoes, so it's best to go up half a size with Asics.

Do Asics run bigger than Adidas?

Adidas tend to fit a little more narrow than Brooks or Asics. If you have a narrow foot, You might be OK with a 1/2 size smaller in the Brooks and Asics.