1.vests and wristbands cannot emit light on their own, and only reflect when light hits them 2.Elastic and adjustable safety vest: from shoulder to waist extending from 14 inches to 20 inches, waist circumference from 27 inches to 38 inches; with 4 adjustable buckles 3.High visibility,reflective material with 360 visibility is provided on the vest, no matter in any weather conditions such as darkness, rain, fog, etc., you can be observed by the car , thus always maintaining safety 4.Suitable for all kinds of activities at night, our reflective tapes are suitable for all ages and genders Please use them when you go for a walk, jogging, running, dogging, biking or even riding a motorcycle. Tie a leash around your dog's neck and use it as an eye-catching collar to improve safety 5.With 4 adjustable reflex straps, it can be used as a wrist strap, armband, leg strap and ankle strap.