Sharon Allen, Class of 2007 Pacific Crest Trail hopeful, has the answer:

But how do you know if you are Gearhead? It doesn’t have to be the BEST gear, you just have to love it as though it is. I still don’t know the cut off for men, but if you’re a woman, it’s easy. When your focus in daily living is around the weight of your equipment and not the weight of your body you are, in fact, a Gearhead. Congratulations!

For guys, the test is whether you have four of everything and refuse to part any of it because, well, who knows when you might need hot and cold running Wag Bags?