C_FLEX Insert: Rome exclusive technology that creates the only flex-adjustable ankle strap in snowboarding. Rider customization is achieved through a removable insert that forms the middle layer of the PF Leather ankle strap. Every Targa binding comes with two different durometers of the inserts so riders can customize their toeside flex to three different levels: soft without a C_Flex Insert, medium with the soft insert, and full support with the stiff insert.