I'd say Oak hit the nail on the head with the pear shape at least for the the Butterfly by Terry. I am the definition of pear and that saddle fits me freakin' awesomely! (I think that's a word ) I switched almost all my bikes to that saddle b/c I can't find one better. A word to the wise though, buy the high end one not the middle of the road butterfly because the padding IS different. The one with Ti rails is super flexible and contouring and I bought a cheaper one with chrome alloy rails and it was awful; hard as a brick and no flex at all. The foam was different and the covering was different, in fact the covering on the cheap one started coming apart at the edges . However the textured covering on the Ti one really is nice and it keeps you from sliding on the saddle while you are riding