Our waterproof dog collar in Emerald perfectly balance style and function. We've paired it with solid brass hardware for sizes S-XL and stainless steel for sizes XS/S, both of which are resistant to rust and extremely sturdy. Genuine Beta 520 Biothane® is a material that looks like leather but with added benefits. Biothane® is a non-toxic material that is lightweight, stain-resistant, and easy to clean! Its polymer-coated webbing is durable, maintenance-free, and will not mold or mildew (which means no icky smell!). DETAILS: • Sizing chart in photos • Made in the U.S.A. • Matching stainless steel leash or brass leash HOW TO MEASURE YOUR DOG FOR A COLLAR: The easiest way to ensure that you order an accurately sized collar is to measure around your dog's neck with a flexible body measuring tape where the collar would naturally sit, then insert two of your fingers for comfort.