These tights feature Inner Muscle Core & Leg Balance technology. This technology consists of highly elastic panel inserts at the waist & lower back which lead to enhanced posture & movement. The same technology is situated at the thighs & sides for knee cushioning & reduced muscle fatigue. The tights also feature excellent moisture wicking properties for comfort & performance as well as strategically placed 360 degree reflectivity for safety.*80% polyester, 20% polyurethane