Sierra Designs DriDown™ is natural down insulation improved with a molecular-level polymer that provides a hydrophobic finish to individual down plumes. You no longer have to choose betwen the lightweight, compressibility of down and the "warm when wet" advantage of synthetic. By creating a water repellent down insulation, we effectively have removed down's downside. The result: DriDown™ stays dry longer, lofts better, and dries faster than untreated down, keeping you warmer in any environment.
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