If you have a small hole in the toe or sole of your climbing shoes, a shoe repair kit will work best. Many climbers may use glue, like Shoe Goo, Barge Cement, rubber glue, or even super glue. In this situation, cover both sides of the holes with glue, smooth it out, and then let it dry completely. This is a quick fix and is not meant to be permanent. For longer-lasting mend, get your climbing shoes resoled.