If you ski, you know that it feels like you're flying down those hills. But how fast are you really going? Twenty miles an hour? 40? 50 or 60 ... thousand miles per hour?

Now, I know there's a lot of gear involved in skiing, but if you're a speed demon, you should probably add the Silva S1 Speedometer to your list of necessities. Designed just for Nordic and alpine skiers and snowboarders, it measures ground speed as well as distance traveled.

"Utilizing advanced radar technology, the speedometer calculates your speed and distance and wirelessly transmits all the information to the versatile receiver which can be worn via a carabiner, wrist band, or lanyard." And that's not all.

The Silva S1 Speedometer also has a seven-day internal performance logbook, alarm clock, and a light for nighttime skiing. You can also purchase the optional heart rate monitor accessory, so you can track your workout even if you're cross country skiing (or snuggling up to that cute snow bunny at the lodge).

You can get your own online in a variety of places. I found it listed at Amazon for $178.55, at CampSmarter.com for $154.39, and at Overstock for $109.99.