Very preliminary testing says that this is a comfortable, higher quality sock. The stay dry and durability variables look good. The large is a bit tight on my size 11.5/12 man feet, just because I like socks loose. May opt for an XLrg next time. I have a hard time seeing these or any socks last for the guaranteed 3 years, but I certainly believe they may be leading the pack and would work well for dry and reuse travel situations. Will update later for final review.