This is my third pair of Acorns in the past 8 or 9 years.  So comfortable and warm on those cold Minnesota days, and the dang things last for years!  I'm pretty sure that the pair that I just replaced were almost 5 years old.  No problem tossing them into the washer and dryer when they get a little smelly and they're fine to wear outside to take out the garbage or whatever.  Definitely on my list of Highly Recommended products.