Seems to be a fairly common issue with some of the Rukka jackets where the inside of the neoprene collar becomes worn due to wear and tear, it doesn't affect the way the jacket works but looks bad.
Decided to make a permanent repair on my ARMAS using self adhesive Goretex patches ( £7 for two from Go Outdoors) made a template with masking tape and cut the patch material to size and then applied .
The repair on my jacket is now 2 years old and has been through two wash cycles and reproofs in that time and is still holding up
(unrepaired picture is borrowed from another thread but my jacket was the same )
Decided to make a permanent repair on my ARMAS using self adhesive Goretex patches ( £7 for two from Go Outdoors) made a template with masking tape and cut the patch material to size and then applied .
The repair on my jacket is now 2 years old and has been through two wash cycles and reproofs in that time and is still holding up
(unrepaired picture is borrowed from another thread but my jacket was the same )