I just did 1500 miles, aboout half in temps over 100, the rest in mountains and along a chilly pacific coast. I ordered a set of the beads for the trip and couldnt be happier. I bought the set for me and the pillion and it was way under a hundred bucks.
I lent the pilloin set to another rider on a Harly when we were in the desert. He was complaining about sore butt and he was amazed at the difference.
I got them from
http://www.beadrider.com/