Buckle closure High Visibility: Made with 3M Scotchlite reflective material and high visibility elastic bands, the vest offers excellent visibility day and night, keeping you safe from vehicles whilst exercising. Fully Adjustable for a Perfect Fit: Extends from 33" to 59", made with soft and durable elastic bands, which can be adjusted with buckle. It can be worn over any clothing, from T-shirts to thick winter jackets. High Versatility: The vest fits comfortably and does not restrict your movements. It is suitable for any outdoor activities from running, jogging, to cycling and walking. Lightweight and Portable: The vest is lightweight and compact enough to carry and store anywhere. Salzmann 3M Reflective Vest High Visibility Cross Belt with Adjustable Straps Made with 3M Scotchlite - BVKI0HAVP