How in the world do you choose one? I may have asked before, but I don't remember if it was in here. Is it a personal butt feeling or is there a one size fits all saddle? And do you guess what would feel good? Is there protocol for this? My saddle is getting a tad more unbearable, and apparently it's not just me as I have read many reviews on my bike (Trek 5000 2007), and most changed out the saddle pretty quickly.