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The lightest offering in Sterling’s 20-year-old Evolution Series, the 9.2 mm Aero DryXP (water-repellent-treated) weighs a scant 56 grams/meter—or a svelte 7 pounds, 7 ounces for the 60-meter we tested. Our testers, a hard-hitting married couple who took the rope on local sport and trad, praised its ease of use, noting that it “handled beautifully” even the first time out, at Shelf Road, and worked great in a Grigri 2. “The Aero holds a knot nicely and unties easily,” said one tester, as she praised its soft catches (33.4 percent dynamic elongation; 7.7 percent static elongation) on big redpoint falls. This is a skinny rope, so ideal for redpoint mode or light-and-fast alpine.