Utilising a revolutionary multi-layer ePTFE-based membrane system and combining high performance face textiles with their patented Micro Grid Backer technology the latest generation of GORE-TEX® Pro products deliver improved ruggedness and up to 28% increased breathability compared to previous versions. The result is better comfort in the most extreme conditions for the professional mountaineer and serious outdoor enthusiast. Based upon many years of proven success our GORE-TEX® Pro products will continue to use a high performance 40 denier face fabric in the main coupled with an all-new 80 denier reinforcement fabric to provide the most rugged, durably dependable range of mountaineering Hard Shells.