EzyDog Neo Collar OUR CLASSIC DURABLE WATERPROOF COLLAR: Made with soft polyester and closed cell Neoprene rubber material that retains less stink than traditional collars, the NEO CLASSIC is fast-drying and easy to clean, durable, padded, soft, and comfortable. BUILT-IN ID CLIP & STAINLESS-STEEL D-RING: We've included a separate built-in ID Clip to securely attach your dog's tags. Plus, every NEO collar features a strong rugged Stainless-Steel D-ring for leash attachment. QUICK RELEASE BUCKLES & ONE TIME FIT SYSTEM: The NEO is fast and easy to get on and off thanks to the durable Quick Release Buckle. Plus, our easy One Time Velcro Sizing System means you fit it once then it's just a simple snap to get on and off. INTEGRATED REFLECTIVE PIPING FOR NIGHT SAFETY: Integrated Reflective Piping means greater visibility in low light CONDITIONS and increased nighttime safety for you and your dog. SIZED TO FIT YOUR DOG PERFECTLY: X-SMALL fits dogs with 12" to 13" necks, SMALL fits 13.5" to 15" necks, MEDIUM fits 15.5" to 17.25" necks, LARGE fits 18" to 20.25" necks, and X-LARGE fits 21" to 24" necks.