Features:- Ultra-Light, Stretch-Woven Fabric For Totally Unrestricted Movement.- Internal Mesh Liner Helps Moisture Escape & Laser Perforations Add Breathability.- 4-Way Stretch Material Moves Better In Every Direction.- Material Wicks Sweat & Dries Really Fast.- Updated, Expandable Center-Back Pocket Is Water-Resistant & Keeps Your Phone Secure, With No Bouncing.- Encased Elastic Waistband With Internal Drawcord.- Secure, Zip Side Pocket.- Reflective Details For Low-Light Runs Specifications:- Material:88% Polyester/12% Elastane.