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Black Diamond's Dynex 10mm Sewn Runners weigh 30% less than nylon runners to save weight on your rack for both summer and winter climbing. In addition to a low weight, Dynex runners also have less bulk, so they don't take up as much space on your rack, in your pack, and over your shoulder. They also absorb less water than nylon and don't freeze--obvious benefits for ice and alpine climbing. You need runners for just about every climb, so use these ultralight ones from Black Diamond.