Depends on what I am doing. Most of the time a Tilley T-4, every so often a straw Stetson cattleman, and when working aound the place or camping an old, faded, OD green USGI boonie hat (with the little loops around the crown removed, don't have much need to camo myself anymore). I really like the boonie hats, they give sun protection, pretty good rain protection (at least as far as keeping the drips off of my glasses), can be wadded up and stuck in a pocket, wet to cool your head in the summer, and only cost about $12 US...