The Yellow Dog Design Braided Slip/Choke Training Collar is the perfect and humane way to train your dog! Featuring a heavy duty polyester braid with a cushioned cored and a metal lead hook. This dog collar utilizes a slip closure, also called a choker style collar. Sizing is given as a single neck length. Measure your dogs neck size or its current collar length (not including buckles) to obtain correct sizing, and then select a size approx 1-2 inches larger.