Wool pile weather stripping double hung tilt window

A home owner from New Jersey says:

I'm a new home owner and have noticed that a majority of my vinyl double hung tilt windows are weather stripped with worn out wool pile stripping.

My question is do I have to replace this wool with new wool? Or is it possible to put another sturdier material in the current wool piles place?

Thanks for the replies.
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Paul from SWISCO responded:
We always recommend sticking with what you have in these situations. Wool pile works great in keeping out cold air, and a sturdier material could cause too much friction when you open and close the sash, preventing it from operating properly.
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