Stunt Puppy Go Dog Glo High Visibility Dog Vest Day and night high-visibility dog vest Breathable, comfortable, and highly reflective Breastplate features a tri-lockster buckle for easy on and off Tri-glides at each shoulder and another on the belly to provide an optimal fit XS/S fits chest girths from 19 inches to 27 inches; M/L fits chest girths from 25 inches to 34 inches