KONG Max HD Ultra Durable Padded Dog Collar with neoprene padding for your dog's comfort! Features ultra durable and exceptionally strong thread, Durable metal snap buckle and a metal D-ring ID tag holder. This collar is fully adjustable for optimal comfort, and is built with ultra-strong thread, extra heavy duty durable metal hardware. Sizing: Small 10"-14" & 1" Wide. Medium 14"-20" & 1.25" Wide. Large 18"-26" & 1.5" Wide. XL: 20"-28" & 1.75" Wide. Please measure for best results, these collars run large and extra wide.