I have found that attempting to reduce footwear weight often causes a reduction in comfort and performance. The Ultra Fastpack has created an outstanding exception to this common problem. With its stability increasing support structure and Cradle Guide technology keeping the bodies alignment in order, the Ultra Fastpack excelled in every terrain with confidence. Ultra light, waterproof, with great traction and support combined to produce a series of shoes which excel. These hikers kept my feet dry in the wettest conditions and kept my knees and ankles pain-free after a 10 hour hike up to an elevation of 4000 meters.