Having been a runner before arthritis set in I have a number of fabric inserts with foam on the bottom from running sneakers, the top fabric reduces the sweat inside when worn without socks. I alternate these inserts and wash when needed. Spenco inserts work well also. Theses are worn inside Sperry topsiders or other loafers type shoes. I also travel with sandals and hiking sneakers. The sandals do get dirty and sweaty but I use them to walk into the water while fishing, swimming in and around water so the get washed frequently. I don't like dirty socks hanging around while camping. I always drive in shorts so I can rub Tiger balm or Biofreeze on my knees and slip my shoes off so my feet don't sweat.