Chest Girth 21.5-27.5, Width 3/4; The harness does not stretch itself.;Since the reflective threads are stitched into the nylon webbing, it is normal to see that the reflective strings are frayed with the stiches where two layers of webbing are connected. The durability of this harness will not be affected. Please note that the reflective threads are stitched into the webbing on one side only.;This harness is a single product. However, it comes with matching collar/leash to complete the look. Collar and leash sold separately.;Picture was taken from a size 3/4(wide) * 21.5-27.5(chest).