ULTIMATE SKINTELLIGENCE. Warm weather and sporting activity can threaten the body with overheating. Power loss is the result. Because 90% of the heat regulation in humans is through the skin. INVENT Summerlight counteracts the risk of overheating. INVENT Summerlight has been created by the X‑BIONIC® developers specifically for use in the warm summer months. Worn next to the skin it exerts its air-conditioning effect according to the intensity of the movement. It cools when you sweat and warms when you are cold.