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Actually, because of the miles and industrial laundering the pro's (and support staff) want simple kit that works. Most team issue bibs use a basic mesh with bound seams for durability and stretch. Yes, gripper hems are low-profile direct attached (as the Rapha hems are), or raw-cut direct silicon print (which brings it's problems of curling hems and fraying over time if you've ever worn Bodypaint shorts). Have you seen a pair to compare the fabric? Anyway, I'm not sure how you could compare it with a photo from ebay.
Which World Tour Team wears Assos bibs....?
How are the pro bibs more advanced than the retail ones? Legit question, not being argumentative.
My Pro Team bibs are the second best I've ever owned. Old Rapha CX ones being the first.