?Attention?They can't illuminate by themselves, they will only be reflective when light falls on them. No need batteries for these reflective vests. ?Elastic & Adjustable?Reflective safety vest shoulder to waist expands from 14" to 24", waist circumference expands from 25" to 45"; You can freely adjust the size of the reflective vest, allowing you to move freely. Our reflective bands are perfect for any age and gender!. ?Unlimited Versatility?Use this reflective product while out walking, Trekking, jogging, running, traffic work, dog walking, cycling, or even motorbiking. Put a band around your dog's neck and use it as a high visibility collar for additional safety!. ?Highly Visible & Safe?360 Degree reflective vest keeps you safe in all weather conditions. Super reflective running gear can be seen from 800 feet or more. It is also super lightweight easy to carry. You can slip them on and adjust the straps to your comfort. You don't need to worry about sweaty vests that add another layer of clothing. ?Comfortable?This reflective gears are made with durable polyester, strong belt buckle, last long time; lightweight and breathable, comfortable wearing, you can wear them over any clothing in any season, also easy to fold, you can carry it in your pocket. Made in China. Nylon fabric + adjustable belt buckle.