bond pet Waterproof & Durable Collars for Dogs. (Pink, Blue, Black, Red) Easy to clean Antibacterial, non toxic and hypoallergenic material Water resistant and durable. Perfect for hot summer and cold winter. Made of high performance TPU rubber Medium size: Width 7/8, Neck 15  - 18 (Measure your dog's neck using a flexible tape, making sure you can loosely slide two fingers between the neck and the tape)