Under Armour ColdGear Reactor Pants

Before you warm up, it traps more heat. As you crank it up, it cools off. You'll be distraction free, from start to finish. Lightweight Reactor is intelligent insulation that adapts to your activity level for the right breathability & warmth for what you're doing Expandable center-front waistband pocket is water-resistant & keeps your phone secure, with no bouncing 4-way stretch material moves better in every direction Soft, knit waistband with interior drawcord ensures a secure, comfortable fit Invisible, zip side seam pocket 360° reflectivity