we used a poly tarp for awhile, but decided we wanted something a bit more fitted and rugged for all season use, so we built a sunbrella shade...
we added grommets to the boom tent in the locations where the boat has something to tie to, so its easy to erect and takes about the same amount of time to secure it with bungie balls as it does to get it unrolled and shook out over the boom....
after its attached in the proper spots, the boom is raised on the topping lift, tightening it up and creating standing headroom throughout the cockpit. its high enough that it does not seem confining or claustrophobic. (now we would like to make some privacy curtains for the lifelines to keep the breeze to a minimum in the cockpit on a cool evening)
we have used it in the hot sun and its nice to have the shade, but we found its full value during a terrible rainy, windless day during our vacation..... we had it up the day before for sun shade, and left it up over night to keep the dew off, but then the weather turned wet in the night... the next morning we left it up while we motored across our passage to the next planned anchorage and stayed dry doing it. it was more enjoyable that way...