GBF models are Bologna Comfort Flex Construction. The "new" formal shoe that is the industries standard formal loafer. The details come from the modern toe shape and gross grain strap on the upper. The Bologna construction is a historic shoe making technique of making shoes where the lining and insole is stitched together and then sewn to the upper. This construction is called “saccheto” meaning bag. It is very light and flexible which leads to very comfortable shoes from the initial wearing. Ideal for formal and black tie events.