The patagonia sun shade hoody is my favorite for wearing at high elevation or on the water when there is some wind though it can be too hot if their isn't wind.

The patagonia sun shade hoody is my favorite for wearing at high elevation or on the water when there is some wind though it can be too hot if their isn't wind. For warmer conditions there are some great pieces in their summer trail running line (on clearance at the moment) including the air flow and gamut shirts: http://www.patagonia.com/us/shop/web-specials-mens-trail-running?k=1D-3m-ga http://www.patagonia.com/us/shop/web-specials-mens-trail-run... Edit: opt for the stuff with mesh zones, the straight cap 1 stuff doesn't breath as well. Their merino 1 t shirts are also nice. Also check out fly fishing clothing by them and others for sun protective clothing with a less athletic look.