I received these as a gift from my neighbors who raise Alpacas.  I help them out with my tractor now and then and they repaid me with these extremely warm and comfortable socks.  Nothing scratchy about Alpaca wool, just very soft.  I never wear socks to bed but on Wisconsin winter nights I gave these a try and my feet never became uncomfortably warm and now use them for lounging around or in bed.  I wash them by hand and air dry as I want them to last for a long time.  There is nothing like the Extreme Alpaca socks.  I just bought a pair for my wifes birthday as she is jealous of my socks.