Coming in at a mere 8oz the Patagonia Nano Puff Men's Vest is your go-to layering piece for men who prefer a synthetic puffy, or are out and about in wet or damp conditions which might stress a down piece. Treated with a DWR durable water repellent to shed mist and damp this is the piece to throw over a fleece when you need a windbreak and extra warmth, pop over a flannel when you’re working outside this autumn, or add as a second midlayer, a piece that won’t encumber your arms or add bulk under a jacket, but will add that critical extra core insulation on a particularly bitter day. Nicely, this packs down into its own pocket with a carabiner loop for clipping to a pack, making it a great piece for travel, trails, and town. One of those additions to the core outdoor wardrobe that extends the comfort and range of everything from your tee shirts to a winter parka and is always front, center, and grabable in your closet.