I try to use SmartWool, which is mostly dryer-safe. My base layer doesn't get much use, but it often goes with me whether I need it or not, and when the trip's over, all my clothes take a trip through the washer and dryer, and so far everything's held up fine. My Smartwool hat gets used through all the cold weather on my commute, and, as a result, it can get pretty sweaty at times, so I send it through the wash probably once a month or so during cooler weather. So far it's held up fine.