What is the leather for around the vinyl widows on factory made or expensive tarps?

by Laura
(North Vancouver bc )

Just started repairing tarps and about to do a 34 sun dancer window replacement. Have done the two top pieces with Top Gun 9 wanted something waterproof on that flat surface
Windows client wants something that can be taken off easily. Right now, thick widow cracked and zippers at end of lives so need to do something before the real rain starts here on BCs south coast. I brought the panels in and they have leather or such material cut out from one piece covering the joint between the linyl window and the Sunbella material like a window trim. There must be a purpose to this other then the look or stopping the thick plastic from cutting things? I can keep on guessing but would like to understand so can make a workable nice replacements. I'm going to be using the double sided tape on them to help seal so thanks for that tip.
Thanks Laura

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