Living as I do, in a house in which several people do the wash and not everyone knows which items need special care (where it's an accomplishment just to finish the wash and fold it), I've washed and air-dried and washed and machine-dried both FK Heritage Hose, as well as several pairs of USA Kilts-sold hose. The Heritage hose shrink a bit, but stretch back out, and the only undesirable change I've seen is the "fuzzy factor" on both kinds. The navy blue and hunter green hose have both been shaved with a de-piller since they've been machine-dried, and I try to avoid putting them in the dryer if I'm the one "moving the laundry along."