Sidi Men's Genius Fit Carbon Mega - Wide Sole - Cycling Shoe (44.5) fabric Millennium 4 Carbon Composite Sole. Caliper Buckle two-way ratchet for easy on-bike adjustment with incremental tightening and loosening. Adjustable Soft Instep Closure System and padded tongue eliminate pressure points. High Security Velcro wont shift or slip. Mega Size - cut with more material throughout, and a larger volume heelcup. Mega sizes roughly correspond to a EE/EEE width on the Brannock sizing scale.