Patagonia Nano Puff Vest Synthetic vest (XS, sand) - Keeps you warm, conforms to your every move and looks good to boot: the Nano Puff Vest from Patagonia will serve you well when the temperatures drop. The lightweight ripstop fabric on the outside is tough, durable and comes equipped with a wind and water-repellent DWR. The insulation used for the vest is PrimaLoft Gold, which is a synthetic insulation material that is lightweight, compressible and boasts excellent insulation properties, even when wet. The quilting pattern serves to stabilise the insulation, preventing cold spots and looking pretty cool in the process. The collar is high, and the bottom hem can be adjusted using a draw cord to seal in warmth. The athletic fit and the sleeveless construction allow for maximum freedom of movement. The two zipped hand pockets are perfect for warming up your hands, and the zipped inside pocket doubles as a stuff sack for the jacket. Whether you rock it on its own or as a base layer, the Nano Puff Vest from Patagonia will always keep you warm!