Our two tone, waterproof collars and leashes are made with PVC coated webbing, comparable to Biothane products. This material is water + stink + dirt proof for the most active and playful dogs. Hardware is durable and plated in a soft matte silver or gold color. We know our pets love to swim, roll in the mud, and dig in the sand, after a full day of play just handwash your Lucky Tags collar in warm water and mild soap, then dry. No more stinky or soggy collars. Product tested in the pool, beach, snow, mud, and sand on our Millie. SIZESXS - 5/8 x 15 inches, fits 9.5 - 12.5 inch necksS - 5/8 x 19 inches, fits 12 - 16 inch necksM - 3/4 x 23 inches, fits 16 - 20 inch necksL - 1 x 27 inches, 20 - 24 inch necksMeasure your pet's neck with a soft measuring tape, include wiggle room. Collar should fit snug, but be able to get 1-2 fingers inside for comfort. Matching Leashes and Silent Tags are available.