Looking for a new pair of shoes but want to ensure a performance fit without causing (too much) permanent damage to your toes? Here’s a flow-chart guide to help you find the perfect pair, as downsizing to the point of crippling pain (or, less commonly, out of control upsizing) will only make you hate your shoes and climbing in them.

And here’s 5.10’s take on shoe sizing for a few more tips:*

*This message is found on every box of 5.10 climbing shoes.