I've just been lurking around here for awhile and figured I'd give back.
These are my first pair of IH, and what really sold me on sticking with them in the future. I had my eyes set on some 634XHSib initially but figured some time in the classic material would be the best introduction to the brand. What prompted this is that my new pair of XHSib showed up this week.
These have about a year of wear on them, the biggest contribution to them is working at a cabinet shop.
I machine wash them with no spin and cold water with mild detergent, machine dry to about 80% of the way dry then hang for the remainder.