Similar to a Martingale, the limited slip base tightens and loosens based on pulling and is good for fast on and off as well as stopping dogs from backing out of the collar. The slip section is a tab with loop on the end.
Narrow Bases are 1.25in wide reduced to 3/4in by default. Narrow base with a border is 1.5in. Narrow base with padding is 1.5in. Narrow base with a border and padding in 1.75in wide.