It may look like your ordinary Martingale, but don't be misled by looks.
We have made it better, and here is why:
The standard Martingale is designed with two loops: an adjustable "collar loop", and a fixed "slide loop" with an attachment for a leash. Both parts of equal width.
Difference: Collar fixed slide loop is slightly narrower in width than the collar loop, so it slides with ease from a pulled-tight condition to a loose, relaxed position. Thus, our Martingale prevents "sticking" in a tightened position.
Different. Better !! Measurements:
Small is 1 3/4" wide.
Medium and Large are 2 1/4" wide.