Collars are made from a variety of materials, the most common being leather or nylon webbing. Less common materials may include polyester, hemp, metal, or "tarpaulin" (vinyl woven with cotton). The collar can be decorated in various ways with various materials. Basic collars for everyday wear are: a button collar, also called a flat collar, with a clasp similar to a belt buckle, or a quick release clasp, both of which fit loosely around the dog's neck. The identification is usually attached to such a collar; it also comes with a loop to which a leash can be attached. This is the most standard collar for dogs. The flat collar should fit snugly around the dog's neck. It shouldn't be so tight that the dog will die, and it shouldn't be so loose that they can slip out of it. In general, you should be able to fit a two-finger nylon quick-release snap collar under the collar with identification and medical labels. Safety Stretch Collars contain a stretchy panel in a sturdy nylon collar to escape potential strangulation hazards such as branches, fences, gates and other dogs. Unlike splits, the stretch collar acts like a traditional collar when clipped with a belt. Special purpose collars and accessories Reflective collars are usually made of nylon webbing with reflective tape to ensure dogs can be seen through approaching vehicles at night