Видео с ютуба Boot Delaminating

Why do boots that have not been worn for a while delaminate?

Fixing old boots , sole delamination #minutefix ™

Lowa Boots Sole separation/delamination

MEINDL boots sole delamination

Can Delamination On Hiking Boots Be Fixed? - The Hiker's Advice

Ski Doo boot delamination