CW-X Women&#39;s Insulator Expert Running Tights, Black/Grey Stitch, Medium Polyester 80% / Spandex 20% Imported Targeted support to knees, IT band and major leg muscles, Using our advanced body mapping technology, we provide exceptional fit that is annotimicaly correct. Insulated support layer regulates body temperature and transports moisture Auto Sensor fabric moves perspiration away from skin and regulates next-to-skin temperature Silver dioxide fiber makes fabric antibacterial. The supportive conditioning Web technology provides targeted support to specific muscles and joints where it is needed most Experience less muscle fatigue, faster recovery and targeted support Versatile performance for both outer wear and as a supportive base layer. Flat seam construction eliminates abrasion, increases comfort, and enhances fit.