Long trips can take you to unfamiliar climes. Riders contemplating rides across the southwestern deserts often make the mistake of dealing with the heat by stripping down and wearing as little as possible, which is the exact opposite of what they should do. The more skin you expose to the elements, the more moisture the hot, dry air can suck out of you. You can get badly dehydrated, sun burned, wind burned, and fatigued in less than an hour. Look at how cultures that live in desert areas dress and mimic them. Wrap yourself up to slow down the movement of air over your skin and subsequent drying of perspiration. We usually deal with a hot (over 100 degrees F) day in the Mojave desert by hosing down our clothes then putting a jacket with some venting over it. You don't want a torrent of air over the wet clothes, just enough circulation of provide evaporative cooling. A scarf or other wrap that's soaked and tied around your neck makes a big difference. On these hot desert days, just hosing down your shirt and riding with nothing over it will only keep you cool for a few miles before it dries out. An apparel layer over your wet clothes to slow down the evaporation is what's required. If your jacket isn't vented, open the sleeves and zipper part way. A former riding companion, who rode across the Mojave frequently during the summer, used to don rain paints over hosed-down jeans to keep the cooling water from drying too quickly. That was over 20 years ago. The rain pants later gave way to some updated overpants that let a bit more air flow, but she insisted she was cooler with the rain pants on those 120-degree days.