Small - 12 to 18" | Width - 1" ||| Medium - 18 to 22" | Width - 1" ||| Large - 22 to 28" | Width - 1.5"
Martingale Collars are much gentler form of correction than choke collars. They are used and recommended by top trainers all over the world.
More comfortable than standard collars
Prevents escaping when fitted properly