Durable, Long Lasting Webbing - Made of woven nylon. Durable, washable and soft to the touch. Convenient, Strong Buckle - Lupine Pet and YKK, the leading buckle manufacturer, have come together to design the highest quality, strongest plastic buckle on the market. Featuring an easy, convenient side release. Heavy-Duty Steel D-Rings - Lupine’s welded steel D-ring is rust resistant and designed to hold up to years of heavy use. Adjustable, Easy-to-Use Tri-Glide - The non-slip teeth molded into the nylon plastic tri-glide keeps the collar at the correct size. Stitching – Every Fiber Matters - Lupine utilizes the bar tack commonly used in mountain climbing products where superior strength is crucial.