San Francisco is known for its unpredictable temps; It could be a nice and warm 75 degrees downtown, but much cooler in the Haight where you get a crisp sea breeze. But no matter where you are in the city, it's all downhill once the fog rolls in. So be sure to dress in layers. One way to keep warm and stay discreetly connected to your tunes is with the HoodieBuddie. The headphones and MP3 jack are built right in to the sweater, so you can make like the locals and play your jams on the bus.