Good design is working within constraints to solve a problem. Finding the ideal balance for opposing constraints is the challenge. Comfort and durability are generally opposed in leather saddles. But we've struck the balance. In X Series, a soft full grain leather top is supported by a thick stiffer laminate layers and 4130 chromoly rails. Comfort has a name. We call it Flex-Fly. The specific shape of our patented slot's inverted rear wings allows the saddle to move with you. It reduces perineal pressure, sit bone pain, and saddle sores. This saddle has no break in period. It feels good from day one. The thick support layer helps increase the longevity of the saddle and provide the right amount of elasticity under your sit bones.