Our team used Castelli for a while, then went to a competitor for a couple of years before returning to Castelli. The aero-race bib is low cut, but not uncomfortably so. I don't like extra, unnecessary material when it gets hot in the summer, so the castelli stuff is fantastic. Plus, it doesn't get much better than the X2 pad. My 3-4 year old castelli bib shorts (with X2) are still more comfortable than the other brand that we got just last year...they are that good.

-Jeremy