When cloth is made, the selvaged part is the edge that won't come undone.
Selvaged cloth is very strong and won't fall apart easily.
Examples:
The selvaged edge won't come undone.
This is a selvaged cloth.
The selvaged part is very strong.
I only buy selvaged cloth because it lasts longer.
The selvaged part is so strong, it can't be broken.
I like to use selvaged cloth for my projects.