Patagonia Nano Puff Men's Jacket Size:L Control Zone Ventilation E32IR006 FRESH BLUE BOTA S Control Zone Ventilation particularly in the tail The midlayer you wear for a day on the mountain that compresses into it’s own pocket for packability when you’re out on the trail the Patagonia Nano Puff Men's Jacket uses incredibly lightweight and highly compressible 60 g PrimaLoft® Gold Insulation Eco paired with a ripstop shell with a PFC Free DWR coating to repel light rain and wet to create a jacket that wears as well on its own as it does under a shell while the inner chest pocket has a reinforced carabiner clip in loop: stuff the jacket in the pocket and clip it to your pack for added warmth when you hit the summit or take a break