Keeping your core warm is of the utmost importance when the mercury drops and to help you do this Patagonia has created the Men's Nano Puff Vest. Perfect for cool to cold weather insulation, this Patagonia Vest is constructed of a weather resistant 100% recycled polyester shell fabric and it has 60 gram Primaloft insulation that will keep you warm even if it gets wet. Whether you choose to wear the Men's Nano Puff Vest over lighter layers or use it as a layering piece under other outerwear it will definitely help keep you warm and comfortable. This vest also has zip hand pockets for cold hands.