Hello, Jack! First of all, I think you need "the way it (instead of "in") colds your ears". Then, I' d say "are" is the right way to say it, because you have 2 subjects there: the liner and the way etc...
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1. The soft-foam comfort liner and the way it holds your head and ears is vital
Hello, Jack,
I'm afraid I don't really see when you can say such a sentence. Could you give me some context?