Don’t panic! These are not stained, they are simply crease lines that have occurred from the manufacturing process. Our seamless fabric shorts are dyed, dried and ironed before they are folded and placed inside their bag.
Temporary crease lines/wrinkles may have formed from the way the fabric has been stored and folded.
A gentle wash or 2 and air drying out of the sun may help smooth out any creases or winkles.