What do you need from your goto running shorts? They need to be light and stretchy to let you move, and have a liner to keep you cool and dry. Done. Ultralight, stretchwoven fabric for totally unrestricted movement.- Internal mesh liner helps moisture escape and adds breathability.- 4way stretch material moves better in every direction.- Material wicks sweat and dries really fast.- Updated, expandable centerback pocket is waterresistant and keeps your phone secure, with no bouncing.- Encased elastic waistband with internal drawcord.- Reflective details for lowlight runs. Material: 90% Polyester, 10% Elastane. Ref: 1378869539.