Patagonia Nano Puff size SMALL in Roamer Red with contrasting zippers. Excellent condition. I have too many Patagonia nano puffs so I’m getting rid of the ones I never wear. I have worn this one maybe twice. Patagonia Nano Puff® is a lightweight and packable synthetic insulation layer that stays warm even when wet. With fit 60-g PrimaLoft® Gold Insulation Eco 100% postconsumer recycled polyester with P.U.R.E.™ (Produced Using Reduced Emissions) technology, and a 100% recycled polyester shell and lining, this iteration of the Nano Puff reinforces why so many people call this the “magic jacket.”