Featuresr size is optional swaist 346 402 mwaist362 417 lwaist 378 433 r comfortable this sports vest is made from high quality polyester mesh fabric it is lightweight breathable making you comfortable while doing sports activitiesr high visibility reflective stripes on both front and back for maximum visibility and safety at nightr adjustable fastener tape closures on the waist for easy adjustment and comfortable fitr widely used great for running jogging walking cy