Carhartt Nylon Duck Dog Collar I Collar with durability and classic look for the hardest working dogs Quality You Can Trust I Rugged two ply construction with top side: 500-denier CORDURA nylon canvas with Rain Defender and bottom side: durable nylon webbing with duck canvas weave Low Light Visibility I Reflective Carhartt wordmark for low-light visibility Carhartt-Strong I Sturdy half-metal, half-plastic buckle that stays strong but is still easy to take on and off. Rugged slotted metal D-ring with tag holding capability Sizing I Medium (Neck: 12"- 18") Large (Neck: 18"- 26") Measure at the base of the neck. Note: Do not measure too high on the neck as it may result in a smaller than optimal measurement