Hmm, Fizik explains their flex here:

http://www.fizik.it/technologies_wing_flex.aspx

and here:

http://www.fizik.it/technologies_twin_flex.aspx

But those are both good types of flexing. I rode a saddle that was sagging like a hammock front to back at the velodrome, it was hell since we're always in the drops. I finally pulled off the track and nosed it down but ugh. Our instructor thought I was quitting and kept asking what as wrong. "Uhhhhh, my crotchel area hurts and the last time something was this far up it, it had a pulse." Poor Paul, so sweet, but so concerned at times I don't want to announce my problems to the world.