French Martingales are leash/collar combos. They are one piece martingales and are useful for fast on and off without extra hardware. Interchangeable panels mean you can wear in the leash how you like it but still upgrade your style often.
Leashes are 3/4in wide. This is a set width at this time.
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.