The Shot 2 represents the pinnacle of Sidi road shoe technology, with replaceable inserts at the toe and heel to make the shoe an investment that will dominate the road for years to come. The SRS (Sole Replacement System) inserts are constructed from nylon and TPU, and work to protect the carbon in areas subject to deterioration. The carbon sole enhances power transmission too, so you can crank with greater intensity knowing your power will translate to the road. To make the shoe more comfortable, Tecno-3 Push rotor system received a redesigned fit system that splits the rotor mechanism into two separate pieces, allowing the shoe to flex between the rotors for a superior fit. The Shot 2 still features an adjustable heel cup with integrated reflectors, and Sidi revamped the heel cup to be lighter and more durable.