Finally, a visibility vest for your dog that provides the safety and comfort you’d expect for yourself. Constructed from fluorescent mesh and webbing for daytime visibility, breathability and comfort, and breathable Airex® side panels for night-time visibility (meets ANSI standards for high-visibility apparel). Breastplate features a Tri-Lockster buckle for easy on-and-off. Rear buckle with cam and tri-glides at shoulders and belly ensure optimal fit. Two sizes fit most (XS-S and M-L). Made in the USA. Sizing: XS-S fits chest girths from 19" to 27". M-L fits chest girths from 25" to 34". Use a soft tape measure to measure your dog's chest girth around the widest part of the rib cage.