Have no idea what to purchase .SANTINI bib with " twist gel chamois " or CAMPAGNOLO bib with ACS ( Air Cushion System ) . Price is a bit steep for both and I didn't use gel or ACS systems . So , need advice . I just started my season of marathon riding that means 8 or more hours in the saddle ( 200 to 500 km nonstop ) . My old set of bibs eaged significantly and I must replace them by something new and this is ocasion to experiment . I've heard some opinions that gel chamois after one season becomes harsh and is eaging quickly . CAMPAGNOLO say that ACS chamois combine best elements of gel and traditional systems and is very durable . So ? Maybe link to source of independent apparel tests ? THX.