Mammut Eisfeld Advanced SO Pants For maximum performance: the Eisfeld Advanced SO Pants from the Eiger Extreme Collection. Robust, highly elastic softshell double fabric for optimal freedom of movement, breathability and abrasion resistance. The Mammut Eisfeld Advanced SO Pants have been constructed using an extremely abrasion-proof and highly elastic soft shell fabric for durable breathability and allow for a full range of movement in every direction without restrictions holding your back. A wide waistband is fully adjustable to find a perfect fit while two climbing-harness-compatible front pockets with zippers allow you to safely store your essential items. A stowable attachment hook offers a secure fit over mountaineering boots and a zippered leg pocket and an integrated phone pocket inside the leg pocket can safely house your phone. Completing the Eisfeld pants are reinforced seam edges and crampon protection made from Dyneema material adds additional durability.