The OllyDog Martingale Reflective Comfort Collar offers enhanced comfort and durability by incorporating neoprene. This collar features a high quality and durable metal O-ring which is easy to combine with OllyDog leash. This collar boasts a reflective round line that provides additional visibility for your dog, particularly during nighttime strolls. It helps promote safety for both you and your furry companion by offering an extra lighting effect. Slide over your dog's head and gently tighten it when pulled on!