I always turn mine inside out to help prevent "pilling" - I rarely read directions, but I do believe I read this on the Smartwool sock package instructions. I am a Smartwool sock junkie. I am fussy about clean socks, but can honestly wear mine 2 or 3 times to work in (8.5 hour shifts as a nurse) - they don't stink or get stretched out. Mine get cold H2O wash and tumble dry on the medium low setting. If you take them out when damp, they will finish drying relatively quickly too. enjoy! they are the best socks ever! Tokie