I purchased the Patagonia Tropic Comfort Sun Hoody last year. I used it for general travel (not backpacking) in temperatures over 100 degrees, with and without a baselayer.
FYI, the Tropic Comfort Sun Hoody does not have an official UPF rating. Check out the Lightweight Sun Hoody (http://www.patagonia.com/us/product/mens-lightweight-sun-hoody?p=26653-0-950) if you want rated UPF. I opted for the Tropic Comfort because I liked the chest pocket and thumb loops. I don't know if I would make the same choice again.