Okay don't mean to burst your water bubble Cyclebum...LOL Last year when doing 150-200 mile long days here in NH on occasion I would get...what I called, sore feet. I wouldn't necessarily call it hot foot but the feet would ache by the time the ride was over. I asked the same question...essentially, over on the Rando forum and someone posted back what sounded like the stupidest thing known to mankind. The poster said to switch socks. I had been wearing cotton anklet socks during the spring-fall months. Wintertime I would wear...what I consider to be midweight merino wool socks. The poster said to wear wool socks. I thought the guy had to be totally crazy. Wool socks during the summer months...you gotta be nuts. I decided to give it a shot. I have been wearing wool socks ever since...with one exception. As I was coming off my broken ankle a couple of months ago I decided to go for the first 100 miler or the year. I also was going to go back to wearing cycling shoes on both feet. I had been wearing a regular tennis shoe on the bum leg. I had been having trouble on easy days...40-50 miles. Less I wasn't having the problem but once the mileage got up toward 40-50 miles my bum foot would ache right around the ball of the foot. Everyday the same thing. I figured if I even tried to keep the soft soled tennis shoe on for the 100 miler I would end up regretting it big time. Instead I rode with the cycling shoe and cotton sock. At the beginning of the ride it wasn't too bad but by the time I was 30 miles into the ride it felt like the arch support was poking up into my arch. The shoes had changed any at all. I was beginning to wandering if I had did some kind of strange arch damage when I broke the ankle. By the time I got home from the first 90 miles I proudly took of the cycling shoe and put the tennis shoe back on. The next several days the foot remained sore. Once it started to feel better I switched back to the cycling shoe and also made the switch back over to wool socks on both feet. I haven't had the problem since. Their has been a couple of times when I have ridden since with cotton socks and have notice the feet always seem worse off for it. Watch you socks. I think they play more to the tune of everything towards how the feet feel then anything else. I was wearing the wool socks last summer, end of August, when I rode roundtrip from NH-St. Louis. It was in the low 90s several days and I didn't have any kind of trouble with the feet at all, not even literal hot feet. I'm planning on wearing the wool socks for the trip coming up in a few weeks when I head down your way and may end up with coast to coast roundtrip ride before it is all over with a week off in AZ(I hope not but the temptation is too great...maybe the opportunity will disappear if I'm lucky).