GDO Weatherproof Collars are made from ultra durable polyurethane material which are mold and mildew resistance. These collars are light weight yet extremely durable collars that will last for years. They are easily cleaned by simply wiping them down. The collars are built with a safety O ring in each one. They are 1 inch wide cut-to-fit. They come in two sizes medium (13”-16” neck) and large (17”-24” neck). The collars come in three colors, wetlands brown, black and blaze orange.