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Let's face it: Men's underwear can be downright stuffy during the summer. Frigo, a company that sports soon to be ex-Yankee Derek Jeter as one of its investors, has your solution. This high-tech ($30-$100) undergarment, which comes to you via the inventor of the Tempur-Pedic mattress, uses breathable micro-fiber mesh "zones" to keep your "package" nice and cool.
Veskimo Personal Microclimate Cooling Vest
Designed for motorcyclists and for people that have to work in hot conditions, this water cooled vest by Veskimo ($400) is similar to the systems that are used to keep astronauts from overheating in their space suits.
The vest comes with a battery-powered or 12-volt pump with an external pack (which can be backpack- or externally-mounted) filled with frozen water bottles. Chilled water from the pack is circulated by the pump thoughout the vest in order to keep core tempertures low for as long as six hours at a time, even in 100+ degree outdoor tempertures.