I'm thrilled with the Ex Officio briefs I bought for RAGBRAI, a bicycle tour across Iowa during the hottest week of July. The briefs are  light, cool, wicking, comfortable, and I'm not sopping wet with sweat like I am with cotton briefs. I could bike when it was over 100 degrees actual temperature and not be all wet. I thought I'd just wear the briefs on RAGBRAI, but I bought six or seven pairs, and I like them all the time. They're that comfortable.