Fi'zi:k designed the Terra Powerstrap X4 with off-road riding in mind, and that shows in the performance-enhancing features it offers. While traditional hook-and-loop adjustments just pull two sides of the shoe together, Fi'zi:k's powerstrap design configures a ribbon wrap around your foot, providing more security while still only using two straps. The midfoot and the instep are also separately adjustable for customized fit and compression while you're riding. The X4 outsole combines stiffness and comfort in an effort to turn pedals more efficiently on mixed surfaced. It also features a rubber tread for traction and reliability.