All Leather Sofa Creases
All leather upholstery will eventually develop a significant collection of wrinkles and creases with continued use. How fast these develop varies by material thickness, fill firmness, tightness of the cover, and the amount of weight and use the surface is subjected to. This should be considered part of the charm and character of a natural material.

This also softens the leather and makes it more compliant and comfortable. Maybe some people see an old leather chair as an ugly wrinkled old thing. I see a charming, well used and loved chair that is invitingly soft and comfortable that exudes tons of character.