I am prone to developing blisters on the heels of my feet, specifically when I am doing a good amount of downhill walking, for example while backpacking in the mountains. I wear a thin inner polypropolene sock and a heavy outer wool sock. When I feel a hot spot develop in the past, I would remove my socks, cut out an appropriate sized piece of Dr Schole's "Moleskin," and everything would be OK. I have not found the original "Moleskin" for some time and only find a padded version that I'm not confident will work as well. What do you do when you start to develop a blister on your feet?