AVA is an adjustable collar that is 100% water and odor proof with a quick-release cobra buckle for security and convenience. S is ¾" or 2cm wide and weighs 0.14lbs or 63g M is 1" or 2.5cm wide and weighs 0.21lbs or 98g L is 1" or 2.5cm wide and weighs 0.23lbs or 105g Measurement should be taken when the pet is in standing position, do not size up for this collar, please purchase by the exact measurement for best fit. SECURITY The quick-release buckle keeps your dog secured when needed, but allows for easy removal in times of urgency. COMFORT-FIT INTERIOR This design features a comfort-fit interior to avoid rubbing and minimize pressure points on the skin and neck. This collar is made with our signature pliable and extremely soft vinyl coated nylon webbing. • 100% waterproof and odor proof • rust resistant hardware • military grade metal buckle for extra security • solid cast D ring