Combining fashion with safety, the Ultrahund Play Glow line of buckle collars incorporates transportation industry grade photo-luminescent (glow-in-the-dark) technology with our Ultrahund premium quality polymer coated webbing. The color-matched stitching (not riveted) assembly combined with the "true-fit" sizing provides the ultimate in fit, form and function designed to last for years. This collar is waterproof. No smell. Hygienic. Comes in a variety of brilliant colors complete with a glow-in-the-dark "dog tag.Fits neck size of between 18 in. and 22 in.