The wider strap on the pad of the SIDI Techno 3 Soft Instep Closure System spreads the pressure against the strap across the foot. The system is designed for exactly that: to provide a wider distribution of pressure which makes these SIDI cycling shoes more comfortable. The system is also an even more efficient way to transfer leg power to make the bike move faster. When your SIDI straps wear out, the new straps are easy to install so you can still benefit from the advantages of racing and riding in the renowned SIDI cycling shoes.