measuring your sit bones

[pinkbikes]

this may be a stupid question: but how do you measure the distance between your sit bones? is there a good and easy technique to do this?

And so Zelda - do you notice any difference in comfort between your two different widths of Ariel seats? I also have the 143 (came on my Era) and absolutely love it but am unsure whether it is predominantly the width or shape that does it for me and how transferable that is to another Spesh seat.

I'm not as happy with the seats I have on my roadies and would like to try a Jett or similar but am reluctant to shell out the dollars if it is going to be a disaster.