For a shoe to fit correctly, the break in the shoe must be at the first metatarsal joint . what does that mean?

The shoe bends: Where your big toe joint bends. A proper fitting shoe needs to bend where your foot bends at the toes so you can push off properly. If the shoe is to stiff it may lead to tendinitis . If the shoe is very flexible in the wrong way it may not be supportive enough. A good shoe bends easily at the toe break and resists torsion or twsiting in the arch arrea.

Shoe break: That means the place where the shoe bends is over the big toe / foot joint called the first metatarsophalangeal joint. Good luck shopping !