Size Measurements (Inner Circumference) and Biothane Widths:
S 13 - 16 inches, Width: 5/8" layered on 1"
M 16 - 19 inches, Width: 5/8" layered on 1.5"
M/L 19 - 22 inches, Width: 5/8" layered on 1.5"
L 22 - 25 inches, Width: 5/8" layered on 1.5"
XL 24 - 27 inches, Width: 5/8" layered on 1.5"
Need to adjust the size of your collar? Don’t worry, this is simple! All you will need is a flathead screwdriver, or, in a pinch, a spoon should work! Put the pad of your finger on the flat side of the screw on the outside of the collar to hold it steady. Then unscrew the two adjustable bolts from the inside of the collar, and pop them out of the bottom strap. Adjust the length as needed, then replace and completely tighten the screws when you’ve got the collar size adjusted correctly!
Important! Although we use the highest quality screws, they can occasionally loosen with longterm regular wear, so it is important to check them regularly to ensure they’re tightened and secure. You could add a drop of Loctite Threadlocker to the inside of the bolts to set it permanently in place, but keep in mind that if you do, it won’t be adjustable any longer! All other screws except for the two adjustable ones will already come glued and locked. We recommend you line up the slots of the Chicago screws to match the others, in line with the BioThane, so. that if one begins to loosen it is quickly obvious that it has moved. To be clear: we have never had a collar screw come loose that we know of, whether for personal or customer collars, but we know it is in theory possible and something to be VERY aware of.