Hi cooperman, I am using x-bionic for cycling. The bike bib tight is just crazy. It fits like a second skin and the new pad construction is absolutely unique. Other pads feel like a frying pan around your bum ;) The pad from x-bionic is super flexible and has a special air conditioning construction.
There is a special Windskin Bikepant that could fit your needs in winter. I did not try this one myself, but the construction sounds very much promising as it has a partial windskin as a shield against cold wind. at the same time it is supposed to allow the skin to breathe. Well please let me know when you tried it.
4x4