Bib shorts wear

Hello, does anybody know what causes this fibre break up on bib shorts. I have read it is just wear and tear but I'm not convinced. I know you have to use non bio detergents when washing, think I will do them by hand from now on. http://imgur.com/a/kUR5g
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It's unlikely to be the detergent.
How old are they ?
Nothing to to with washing, imo.
I have the same issue with a pair of Castelli shorts I've had for about 9 months. Not impressed.