Ethan Brown——Works at the International Renewable Energy Agency, Lives in Abu Dhabi, UAE.
Collars are made with a variety of materials, most commonly leather or nylon webbing. Less common materials can include polyester, hemp, metal, or "oilcloth" (vinyl woven with cotton).read more >>
QuesHub is a place where questions meet answers, it is more authentic than Quora, but you still need to discern the answers provided by the respondents.