As part of Montbell's Sport series, the Men's Thermawrap Sport Insulated Jacket uses a mix of insulation and stretch side panels to provide freedom of motion on the mountain. Exceloft insulation keeps you nice and toasty even if it gets wet, which would be hard considering the Polkatex DWR coating that helps keep you dry better and much longer than a standard DWR coating. The Ballistic Airlight shell is incredibly durable despite its light weight, and stretchy side panels give you the mobility you need whether you're climbing up a mountain or skiing down it. A trim cut pulls the Thermawrap close to your body for layering on ski days and reducing bulk when you go climbing. If the weather warms up, you can compress this jacket down into its stuff sack and pack it up for when it gets cold again. Store your phone in your chest pocket to leave room for your hands in the pockets when you're chilling at the top of the mountain.