A training collar built like our flat collars - full-grain American leather with polyester contrast stitching to protect your dog&';s coat. The martingale loop provides gentle, controlled correction without choking: it tightens just enough when your dog pulls, then releases. Ideal for sighthounds and any dog whose head is narrower than their neck. Hand-finished in Colorado with finely forged European steel. Built to last for years. Size chart: XS - 1/2" width, 9"-12" neck S - 5/8" width, 12"-15" neck M - 3/4" width, 15"-18" neck L - 1" width, 18"-22" neck XL - 1" width, 22"-26" neck