I've been using this one for a few years now and love it: http://www.rei.com/product/862927/rei-sahara-tech-long-sleeve-shirt-mens http://www.rei.com/product/86

I've been using this one for a few years now and love it: http://www.rei.com/product/862927/rei-sahara-tech-long-sleeve-shirt-mens http://www.rei.com/product/862927/rei-sahara-tech-long-sleev... SPF 50, tons of pockets, quick dry material, vents in the back and armpits for air circulation. It even has little snappy things to hold your sleeves when you roll them up. The added benefit of a shirt over sunscreen is that the shirt keeps bugs off too.