Originally Posted by Boomer
From my experience, it's when the inner core material & the outer core don't have the same stretch factor. It's like there's no where for the extra material on the inside to go after the tension is off & it bulges out like a hernia.
This can be a problem with all double braid cord/rope. Unless the outer braid and inner braid are matched in size and properties, the inner braid will do exactly as pictured.