1) Large size: 16"-24" neck x 1" width ,Medium size: 13"-20" neck x 6/8" width, Small size: 10.6"-15.7" neck x 5/8" width with Heavy duty upgraded anti-escape martingale dog collar. The polyester webbing provides supreme soft smooth flexibility and comfort for your 4 legs friends.

2) Two collars in one: You only need one collar now. We designed this martingale-style collar with strong two D-rings which allow you to switch from a martingale collar to classic basic (non-cinch) collar easily.

3) It won't break or fray as easily as plastic collars. Colorfast dye means this collar won't fade or run when wet. Not for tie out.

4）The reinforced stitching is strong and durable. All sewing joints are making them smooth, more comfort to you and your four legs friends.

5）This escape-proof martingale collar is a single product. Its matching two handles 6' leash (B07ZBQFBLC) sold separately.Our quality is guaranteed. If you are not 100% satisfied with the product we will provide customer service, refund, or new product.