Carhartt-Strong: Carhartt Nylon Duck Dog Collar. Collar with durability and classic look for the hardest working dogs Durability: Rugged two ply construction with top side: blanket stripe fleece and bottom side: durable nylon webbing with duck canvas weave Versatility: Reflective Carhartt wordmark for low-light visibility Features: 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: 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