20114879 Filson Men's Ultralight Jacket Warmth without weight, wet or dry-a perpetual challenge for outdoor clothing. Not only does Filson's Ultralight Jacket solve this conundrum, it makes one wonder how it was ever a challenge to start with. Windproof, warm, breathable and compressible, you'll notice it only by the sheer versatility and comfort it delivers. Filson's Ultralight Jacket is ideal for active use without overheating, light enough to layer underneath a rain shell, and packs small enough to go with you on any adventure.