It is reflective material from 3M called Scotchlite. It is the same premium material used by our first responders like firefighters, police and EMS. It is a tremendous safety feature when walking your dog at night - whether the sun is setting early or late. It is very interesting material in that it reflects a car’s headlight 1000 feet away – which is a fifth of a mile, more than 3 soccer or football fields away. It has microscopic polished glass beads in it that somehow make it do this magic act.