Hi Trawlergal1990,
Welcome to Trawlerforum.
Following your question about fender cover, here are the ones I currently use on my boat, Grand Banks 42' MY :
1) Universal roll fender cover, polyamide made, elastic (Sunbrella is not elastic), in a 5 meter (15') length, Navy blue, easy to cut to the desired length with scissor, 12 plastic straps. For fenders with diameter range from 10 to 25 cm.
https://www.imnasa.com/en/universal-cover-fender-5m-navy-blue.html
2) Universal roll fender cover, polyester made, elastic, in a 5 metre (15') length. Designed for self cutting. High-quality automotive polyester.
Fender Sock 'Roll Neck' 5M Navy
One roll of #1 & or #2 = 6 fenders on my boat.
#2 is my favorite, best quality, polyester is lighter and more robust (a lot more) than polyamide. Unlike polyamide cover, polyester has no "sponge effect" when raining or washing out the boat.
The main reason for fender covers is not only "to make the fender look better" even if fender is hard to clean as Peter rightly pointed out. Main reason, only in my opinion, is that fender becomes less or more dirty quite fast
then results in soiling the hull by contact.
Yes,
"I can provide evidence to support it however" (photos attached).
I hope that would help you.
Respectfully,