Breathable where you want it, durable where you need it Black Diamond Recon Stretch Pro Bib Pants Include Backcountry Kills. Membrane BD. dry is designed for mountain lovers who know how to detect bad weather and has a reinforced seat knees and edges. Breathable stretch upper designed to move and breathe on the skin so you can earn your turnovers without working long hours or feeling restricted by suboptimal clothing.