Pile Weatherstip for Sliding Door - What is a fin seal?

A home owner from El Cajon, CA says:
Your Gray 58-158 7/32 X 5/16 should work except I prefer white and mine does not have a fin seal. What is a fin seal and do you have white? thanks, Ed
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Casey from SWISCO responded:

Thanks for writing in your questions. The 58-158 is only available in gray. A fin seal is an added single pliable barrier that runs along the center of the pile weatherstrip. 

I hope this has answered your questions. Please get back to us if you should have any further questions. 

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