The Coastal Adjustable Check Training Dog Collar with Buckle is a martingale-style training collar gently corrects your dog without choking. It combines a nylon collar with a limited-closure chain loop that tightens only enough to give a subtle correction and prevent slipping out, but not so much as to cause discomfort. The collar features a buckle for easy on/off convenience. It’s perfect for humane training, as the partial chain provides an audible cue and prevents the collar from becoming too tight, while the nylon portion protects your dog’s neck fur and offers bright, classic color options.