The one in the middle, designed “for ruptures difficult to hold,” has a “steel spring” and “sweat resistant leather.” These are not words you want to see anywhere near "scrotal."
Why don’t you see ads for these in the Sears catalog anymore? Because men don’t have to pick up heavy things as much as they used to, and there are fewer ruptures. Guys just don't have to truss up the ol' scrotum as much as they once did.
Note that there are "New York" trusses and "Boston" trusses. And "French" trusses. If you needed a Houston Truss, good luck; men down in those parts didn't admit to needin' anything to . . . to support men down in those parts.