The main drawback to training indoors -- other than the terminal boredom it brings on -- is the sweat that pours all over your bike. It's hell on your headset and on the bolts of your stem and bars. The CycleOps Bike Thong is the cure. It's a Y-shaped piece of terry cloth that velcros to your handlebars and seatpost to catch the sweat before it drips onto the vulnerable bits on your bike.