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.