Had my 18' Leopard with the river sombrero. Mid-July shade was great. Hardly put on much sunblock. There were hours some days where it was too windy. Other days, it pulled me along for an hour or two. Best feature is, I always sleep on my boat, and the few nights in rained I just pulled it up and used a thin mylar sheet over my feet to get full coverage. A little tarp to cover one side would help in a down-pour. If the view is great, pop it down. Frankly, after thousands of miles of canyons, I tend to look at the water or around me rather than up very much. Firmly stowed it in major rapids. The only downside I've discovered is biting flies like to ride on it on occasion. As for the fabled Canyon Heat, I'm from Utah and it was vaguely hotter than Here, but if you keep a wet towel handy, it's cool. I realize 115 is hot, but if you work up to it by spending some time getting used to it before your trip, it's cool. One woman on our trip got panicky hot once or twice, but she drove there straight from the mountains.