A general caveat emptor,....
An inexpensive/cheap car cover will:
1. not last
2. not give your car proper protection (UV, bird droppings. acid rain etc.)
3. possibly damage the paint/clearcoat finish (scratches etc)
4. be bulky for storage
5. not fit your vehicle properly
However, a quality car cover will provide ALL the above and MORE.
I performed a thorough research on car covers (as I do not have a garage or carport) and I wanted something to protect my GTI. I chose "Covercraft" with the "Weatherguard" material.
When I consider the cost of my GTI and the cost of a new paint job, in relation, the cost of the carcover was quite reasonable.
"Ya git whut ya pay fer"
shawn0001 provided a good link, and here is another,...
http://www.covercraft.com/
Read and research for yourself, this is YOUR GTI/Golf, and make the decision that you will be comfortable with.
I knew what I wanted, and I wanted the most protection I could afford.
Nuff said,..??
Dub_52