I just bought 8 pair of Hollow socks from this sale, and they are all going back. I have been using Altera Alpaca socks for couple years and they still look new (also have lifetime warranty). The hollow socks start "fuzzing out" after 1 wear and I don't see them lasting very long at all. The fit was also weird. Both the crew and the boot came up to my knees (I'm 5'9" - 11.5 shoe, ordered L) and the boot socks were just way to loose around the foot. The socks were very soft though and the beanie is awesome (only thing keeping).