Why do Jordan 1 crease easily?

That's because when you wear them, you move in them. The natural movement of your foot bends your shoe, causing it to crease over time. If your shoe didn't move with your foot, you'd be pretty uncomfortable. The movement causes the material in the shoe to compress, which can cause an unsightly crease or wrinkle.
Why do Jordan 1 crease easily?

The Crease Beast Duo

The movement of your foot while wearing Jordan 1s causes the shoe to bend and crease over time.