They shouldn't, but AFAIK they do.
The problem is that due to some hard code everything placed in the "head" slot protects from critical hits. That's why Ioun Stones originally were restricted and not wearable by mages. Same for King Strohm's mask. It was supposed to be a quest item that does virtually nothing but soon became the "spare helmet" for mages.
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\"I am forever spellbound by the frailty of life\"<br /><br /> Faceman
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