Thanks! These are made in quite a soft yarn so they feel lovely and light on the feet, yet are 75% wool & 25% nylon and superwash, so will stand up to wearing quite well. The black and turquoise ones are pure wool, but a sturdy wool and tightly spun so should be holding up well too even if they would felt in the washing machine. Most sock yarn is 75% wool 25% nylon and superwash and usually also spun a bit tighter to help it withstand heavy use.they look awesome, what are they like for walking in? Like a few miles in walking boots?