Boot opening way to small to fit comfortably around calf

These are nice boots but the opening is extremely tight around my calfs. The opening is way to small so it's really uncomfortable. They're hard to wear with tights, wearing them with jeans is unimaginable. They're rubbery so there isn't a way to widen or stretch the opening. I don't have large calfs at all. They really need to address this because if it's that tight around my small leg, everyone else has to have the same problem.

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