Our electronic vests, which reflect light and blink, are made of tennis mesh fabric and 3M reflective tape, equipped with 16 LEDs - it allows drivers to see a person riding a bike, walking by the road or changing a tire from a distance up to 1 km. LEDs are powered by 2 alkaline batteries (AA), which allow the blinking elements to work properly from 95 to 103 hours (maximum). Vests can be worn over any type of clothes, or can even be worn directly on the skin for hot summer days. In winter you may easily wear the vest over a jacket without restricting freedom of movement. During the winter, the battery life is shorter and depends on the temperatures outside. LEDs powered by alkaline batteries can work in temperatures as low as -26?C. We are located near Warsaw, Poland. Delivery to any country in Europe is 3-7 working days. For more info. please call Jack