I just purchased one of these from the USA after having seen one at the SV camp, they are excellent. I communicated with a guy by the name of Bob Pitney, and I have to admit the service was faultless. He even kept me up to date on where the cover was once shipped. Now that sort of service is rare these days. There are 2 types of cover, one just for basic short term use as far as UV goes and the other for long term storage. They are fully weather proof and beautifully made.
Because I have a side by side setup I had to get mine custom made, ie wider, and it only cost an extra $30.00 which I think was more than reasonable. Just for info I got the 365 series which is heavier duty.
Here is their website if interested.