Center fin pile vs. Thicker, dense pile weatherstrippin

A quick learner from Denton, MD says:
Assuming you have found sliding glass door weatherstripping with a center fin pile in addition to a thicker, more dense type pile, both with the same dimensions, which style would be the most effective as a replacement for the dense original? The doors were manufactured under the Carvel series by Peachtree.
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Dave Sr. from SWISCO responded:
The manufacturers of today seem to prefer fin seal type wool pile. They believe it keeps air out better than plain wool pile.
A quick learner from Denton, MD says:
I understand the logic behind a fin- like membrane in the center of the wool pile to stop air flow but will it break down easier (crack, chip, fall off) because of plastic fatigue due to bending/ compression and exposure to freezing and hot temperature?
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Paul from SWISCO responded:
Thank you for clarifying! I feel that the fin holds up just as well as the wool pile itself, personally.
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