The Women's Lumyn No Fur Synthetic Down Jacket feels as light and lofty as your favorite puffy, except Spyder didn't use a single feather in its creation. Spyder's exclusive Synthetic Down insulation uses a synthetic that mimics down for lofty warmth, and unlike down, Synthetic Down stays warm when wet. Spyder wrapped up this innovative insulation with a waterproof breathable Xt. L laminate and snow shedding Spylon coating to keep you comfortably dry when the mercury starts to fall. Taped critical seams prevent snow from seeping through the places most likely to let snow in.