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The Swiftwick Four Performance is a top-grade compression sock with 4" of double cuff ankle-support. Made from Olefin, a Nobel Prize-winning fiber, the Swiftwick Performance line boasts extremely fast drying times with superb abrasion resistance for a sock that is both lightweight and impressively durable. Olefin retains less than 0.01% of its weight in moisture and resists deterioration from chemicals and perspiration, and if you weren't already impressed, Olefin has less of an environmental impact than most polymers, making it easier to recycle. Swiftwick combines Olefin with a blend of nylon and spandex to help create a softer, more comfortable sock with excellent breathability. Whether you need a sock for your on bike adventures, or just something for everyday use, the Swiftwick Performance line answers the call!