Patagonia Women’s Nano-Air Vest Size Small EUC! $199 Retail Sold out online! Keeping your core warm and dry is critical in chilly outdoor adventures whether in the rain or snow, or freezing sunny days. A versatile vest has always been a part of my winter wardrobe, however, I feel like I stepped up my vest game when Patagonia sent us the Nano Air Vest to test out.