Bontrager XXX Full Carbon Road saddle

Testing the Bontrager XXX Full Carbon Road saddle at Lekas highway 90km ride last weekend. with a smooth semi flat surface it was easy to move around the saddle to find your sweet spot during different sections of the ride. however after 80kms the comfort level began to diminish.  I was wearing a bib shorts with a medium distance chamois for this ride. At 68g, this could be the lightest saddle I have ever tested.