Backcountry Cardiac GORE-TEX PRO Bib Pants the best of our backcountry outerwear sets provide the perfect balance between lightness breathability and durable coating so we don't overheat on the climb and don't get wet on the road. back down. A three-layer GORE-TEX PRO membrane along with 70D and 100D nylon provide this balance so we can cut catch the air and go under the snowy sky for your pleasure and zippered thigh vents help us shed excess as we climb. go and do it again.