Attmu Reflective Belt Vest, Reflective Running Cycling Belt Vest, Reflective Safety Vest - High Visiblilty Day and Night, Fully Adjustable, Multi-purpose, Light Weight, S/M Highly reflective at night and highly visible in the day. Lightweight design comes with an adjustable reflective harness ensuring a comfortable, yet secure fit which doesn't weigh you down. Easily fastens with durable velcro. This stays in place and won't move around. Attmu adjustable, lightweight, elastic reflective belt vest, reflective running vest, cycling vest, safety vest easily fits all sizes over any outdoor clothing. S/M/L: waist band: 63-100 cm (25 - 39 inch) shoulder straps: 38-58 cm (15 - 23 inch) waist to shoulder.