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Mine are foam lined steel, very solid and heavy. I've had them for > 25 years and still feel uncomfortable hanging. I also use a braced pull-up bar.
I can't believe that plastic boots would be any less capable of holding up an adult than steel. If nothing else, less mass around the ankles would make me more comfortable.
Hope that helps!
Regards,
HG
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It's not enough that we do our best; sometimes we have to do what's required.
-- Sir Winston Churchill
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