Built especially for training and hiking in cold weather, this hybrid style has the versatility to serve as your everyday, all-purpose jacket as well. The front and back panels are insulated with Premium Down insulation. The hood, side panels and underarms are stretch knit for superior breathability and mobility while active.NOTE: Temperature ratings are based on a controlled laboratory test by an independent university lab. Also consider: your sensitivity to cold and wind-chill; time of exposure; activity level; and use of layering.Models shown are 5'9" to 5'11" tall, wearing size S/4, L/12, or XXL/18.