Defy the elements. The Zeroweight Insulator Shorts, made from 91 percent recycled polyester and insulated with fibers from recycled PET bottles, provide the necessary warmth to venture outdoors even on cold days. With excellent freedom of movement and synthetic temperature regulation, these shorts are designed to be worn over tights. Reflective details, an adjustable waistband, and a small key pocket are also included. The perfect outer layer for added protection against the cold. Enjoy insulated comfort for your runs. Run lighter and faster. Quick-drying and incredibly lightweight: performance running apparel that leaves all others behind.