In reply to steveej:
I like smart wool for shorter trips, but like you find that the looser weave causes them to get baggy easily.
I've found Icebreaker socks to be a firmer weave, and they come in a variety of thicknesses. I'm not sure how the thickest compares to Lorpens. The only proviso is I haven't bought a pair for a few years as they last so well, hopefully they're still as good.