• Lightweight Carbon Lite Sole maximizes power transfer with optimized biomechanics:
The Carbon Lite Sole is engineered for optimal power transfer while protecting foot health with biomechanically correct fit. It is specifically engineered for high-performance, high-mileage cyclists, with tremendous stiffness for maximum power transfer and some controlled flex in the toe area that biomechanically relieves stress on the plantar tendon and helps promote circulation.
The Carbon Lite Sole is handmade exclusively of sheets of T700 carbon fiber in a 3k weave pattern (competitors' carbon sole have little carbon fiber content, or user cheaper, lower-modulus T300 carbon fiber). Sheets of T700 carbon fiber are laid up by hand of opposing angles that maximize resistance to mechanical stress and allows for slight amount of controlled flex in the toe (typically layup schedule uses 0? for unidirectional strength, 45? degrees for torsional stiffness, and 22.5? for impact resistance). The sole is heat- and compression-molded with longitudinal corrugations, further increasing mechanical stiffness without added material weight.
An anti-slip toe insert and replaceable polyurethane heel pad are incorporated into the Carbon Light Sole, for walkability.
The Carbon Lite Sole is compatible with the best pedal systems available, and includes a printed 10mm lateral and fore/aft cleat alignment scale on the sole as well as the Look Memory Eyelet for easy cleat alignment and replacement.
• Adjustable Heel Security System prevents power-sapping heel lift:

In 2006, SIDI introduced the Heel Security System, first in prototype Genius 6.6 ridden to victory in the Giro d'Italia, and then as a technical feature on four of SIDI's top production shoes. This elegantly simple solution addressed a critical aspect of performance fit, virtually eliminating power-robbing heel lift.
The Adjustable HSS reinforces the top of the heel cup, and adjusts to securely close the backf the shoe around the rider's heel, just above the calcaneus (heel bone). The Adjustable HSS provides 6mm of lateral adjustment on either side of the heel, improving power transfer and comfort by eliminating heel lift. Turning the HSS adjustment screws counterclockwise tightens the heel retention device, a clockwise turn of the screw opens up the heel area, Each side of the heel can be adjusted independently for an absolute perfect fit.
Other companies have attempted to replicate the heel of the globally patented HSS by using heat-moldable heel cups or internal grippers, but none have matched the HSS's functionality, light weight and ease of use. Like most SIDI small parts, the Adjustable HSS is replaceable, and also available as an aftermarket upgrade for some 2007 thru 2009 SIDI models.
• Patented Techno II Buckle System and Caliper Buckle for easy on-bike fit adjustment:

The very first monofliament line (fishing line) buckle was created by SIDI in 1993, revolutionizing shoe design with the first-ever precision closure system. The latest version of that system, SIDI's Techno II Buckle, provides even pressure distribution with fine-tooth ratchet adjustment on string tension, for ultra-smooth adjustment that helps the shoe's upper conform to the shape of the foot for a customized fit.
SIDI only patented the monofliament closure in Italy, allowing other companies to develop their own monofilament systems. However, the Techno II Buckle remains the leader both in ideal placement of monofilament line (the transitional instep area), and ease of use. Like most SIDI small parts, the Techno II Buckle is serviceable and replaceable.
• Soft Instep Closure System and padded tongue eliminate pressure points
• NEW Lower-profile Soft Instep Closure System buckle and strap pads are ventilated for improved breathability, suppleness and fit
• High Security Velcro won't shift or slip
• Breathable, supple and durable Lorica microfiber upper with cooling mesh panels
• Vented, reflective SIDI Heel Cup
• SIDI Dual-Density Insoles