"Dry," or water-repellent, ropes are a major boon to the ice climber as they tend to freeze up much less than untreated ropes. It is important to check the manufacturer's information regarding the dry treatment. If every strand of the rope is treated individually before the rope is constructed, the water-repellent characteristics wit] last the life of the rope, Most treatments wear off with use, however, so the advantage may eventually be lost. Water-repellent treatments have the added advantages of reducing the friction of the rope through carabiners and against rock, and enhancing the abrasion resistance of the sheath. For easy snow and glacier tours, an 8mm or 8,5mm dynamic rope is probably adequate, while on long, hard routes I carry a doubled 8,5mm or 9mm rope, which gives insurance against cutting and may be used single strand for long, rapid leads on easier terrain. Of course, you can use 10mm or 11mm single ropes as well.
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