Neck:13-18.9",width 1",please measure your dog's exact neck size and add 1-2" to make a proper size. | Made from soft,smooth,lightweight yet strong nylon band with comfortable Neoprene padding,your dog will love wearing | With the high visibility reflective thread on nylon webbing,they show up in the dark if they catch the light from car headlights,street lights or torch, useful and much safer for nighttime walking with your dog | Quick release ABS plastic made buckle is durable and much easier for you to take the collar on/off your dog; Integrated and chrome plated D ring is rust proof, and much more sturdier than those welded D rings,you can feel security of daily walking with your dog | Considerate desgining with silicone tag ring and separate attachment points for lead and ID tags, there is much less annoying jingling