The Patagonia Nano Puff is simply a standard in the industry. It is a proven, packable, synthetic puffy, with a fantastic warranty. The Nano Puff is an excellent backup jacket, and/or lightweight mid layer. There are other jackets on the market that are lighter. There are other jackets that are cheaper. But the Nano Puff is so well rounded, and so proven, that it is an icon in the outdoor industry. Plus it comes from a company that prides itself on social responsibility and environmental sustainability. For me, this jacket is a trusted companion that I’ll always have in the arsenal.