What is the 1000 Mile Reflective Race Vest? High-visibility runners vest, cut away to allow total freedom of movement. When can I use it? Racing, jogging & training in poor visibility & at night Cycle races & training General sports & outdoor activities What size is it? Suitable for male & female wear. One size fits most. How does it work? The 1000 Mile Reflective Race Vest is ergonomically designed to allow freedom of movement when racing or training. Made from high visibility material with 3M reflective strips, this vest allows the runner to be seen & stay safe when racing or training in poor visibility & at night.