So far, I have worn some of the multiclavas and washed some of them.  They look great and perform well.  I wear them all the time to keep my neck warm, and I even use them under a scarf and pull them up over my face on long dog walks.  They don't fog up my glasses like a scarf would, but they prevent frostbite in subzero temperatures.  I don't throw them in the dryer because they dry very quickly on their own when I hang them on a pants hanger.