The Modulus Jacket is the most technical mountaineering jacket from The North Face, making it ideal for extended exposure to extreme conditions. Part of The North Face Summit Series, the Modulus Gore-Tex Jacket was developed for serious athletes, the Summit Series features athlete-tested and technically-advanced apparel and equipment. This premier collection is designed for expedition use from base camp to summit, where the extremes of weather, terrain and temperature demand the highest level of performance.