To protect Trampolines from UV, I really like those “way-cool” custom-made Sunbrella hull and tramp covers.

However, for my purposes and to also protect my limited bank account....I've found that a cheap blue tarp or a garden type shade clothe (purchased from a place like Home Depot or even cheaper, Harbor Freight) works quite well.

The cheap blue plastic tarp lasts for a season or two, depending on how much wind-flapping it is subjected to, when covering the tramp during storage when not sailing.

The shade clothe lasts forever and is lots tougher and resists wind-flapping.

I'd also add that when I use these in a mast-up storage setting, I've tried various ways of affixing the blue tarp or shade clothe cover to the boat.

This is just another cheap and easy way of accomplishing the same goal.