Apparently your waist circumference is about double your neck circumference (at least according to one blogger; can’t find it listed elsewhere online). It’s not quite true for me- my neck is about 1″ smaller than double my waist. I guess it’s good to know for all those times I want to buy something without trying it on. Not that I actually measured. But I did wrap the cord of my headphones around my belly and then pinch the spot with my thumb. Is this waist=2neck thing true for you?