The old overboots used metal ladder clasps, but not sure when those were phased out, 60s maybe, and I don't believe they had any sort of chemical resistance. Great video! Thanks
Ignore the 8 momth late comment, but those boots weren't ment for chemical protection at all, but actually cold weather protection. And the latest I've seen then being used is 1983, but they were probably used even later than that too.
