Running in the winter doesn't have to be an uncomfortable guessing game, at least not when you've got the Icebreaker Tech Trainer Hybrid Jacket. This unique cold-weather running piece uses an innovative hybrid design to give you light weather protection, breathable warmth, and performance stretch in targeted areas. In the front of the jacket you've got a Pertex Quantum Air fabric that repels light rain and steady wind, and does so without feeling stuffy or packing heat. The rest of the jacket is made with a merino-wool and Lycra blend, which gives you an optimal balance of breathable warmth and flexible mobility. It all adds up to a warm yet breathable jacket that'll help you keep a balanced temperature and stay focused as you dream of warm spring races.