Don't let chilly temps stop you from running. A smooth, water-repellent shell teams up with synthetic insulation and a heat-regulating back panel to give you lightweight warmth in a made-to-move design. Fit & Design: Synthetic fill helps keep you insulated and warm Drawcord at the waist lets you cinch in the jacket for a more tailored fit Brushed knit back panel offers the stretch you need for easy movement Zippered side pockets offer secure storage for small essentials Reflective details Whistle at collar Technology: Nike Therma-FIT technology helps manage your body's natural heat to help keep you warm in cold-weather conditions