For more than 70 years, Wrangler's 13MWZ Cowboy Cut jeans have been a tried-and-true wardrobe staple for cowboys across the country. Today, 13MWZ is the official ProRodeo competition jean. We knew a good thing when we saw it, which is why the Wrangler Cowboy Cut jeans haven’t changed much since they were first designed by “Rodeo Ben” Lichenstein in 1947.