I bought these on a whim and they're a little expensive but I wish I could afford to buy about 5 more pairs because they're so great. They're nice and cool in the heat and warm when it's cold. These ride at just the right level at the hip, they don't ride up but you'll also never have to worry about looking like a plumber when you bend down. The only thing is that they're not quite as long as I'd like and are looser than the picture shows, but its good because they're not spandex-y and weird. You can also totally pull them off as short shorts around the house or camp when you feel like bumming it.
If you absolutely have to wear underwear these are definitely the way to go. They're crazy comfortable and you can wear them forever without any stank. They ride a teensy bit high but you can slide them down a little, they just get a little baggy then, but still comfy. They're great for backpacking since the wool keeps you nice and cool and I'd imagine they'd be nice and warm in the winter too. They even double as great pajamas and you can definitely just pretend they're booty shorts and wear them around the house at all times. The best part is that you will never ever get a plumbers butt and they're still attractive without being embarrassing if they show when you bend over. I'd buy these again in a heartbeat, they're worth the cost.