Lightweight, cool mesh body with hook & loop on shoulder for quick, easy on/off. Power button modes on the other shoulder for 3 modes - glow, flash, off. 2 illuminated stripes on the left side of the body, and Scotchlite reflective material around the lower waist. Universal fit with elastic side strap with hook & loop closure. Uses 2 x CR2032 batteries that are replaceable and included!