So in my experience (PURELY anecdotal, so don't put too much stock into it), the covers with the dimpled felt are just pure garbage.
They last for about a year, before getting saturated and torn up by the wind.
We bought a 'Classic Accessories' cover, and it is very solid. It actually uses heavy duty fabric with venting near the top of the the walls.
Heres a link:
https://www.walmart.com/ip/Classic-A...-White/3661667