Sidi MTB Eagle 6 Carbon Shoes Upper: Vernice microfibre & nylon mesh Sole: MTB srs carbon composite sole Tecnology: Soft instep 2, caliper buckle, hight security velcro, adjustable heel retention device, sidi heel cup Sidi Heel Cup The reinforced heel keeps the foot in a optimal position & avoids the shoe being deformed by extreme performance or prolonged pressure. Soft Instep 2 The SOFT INSTEP CLOSURE SYSTEM is a wide, anatomically curved strap combined with a soft, thermo-formed EVA pad that distributes pressure evenly over the instep area. The SOFT INSTEP CLOSURE SYSTEM is adjustable from both sides, to perfectly center the EVA pad over a high or low instep. The system eliminates the need for the High Instep Extender. The SOFT INSTEP CLOSURE SYSTEM is replaceable. Ca;iper Buckle The micrometric closure called “CALIPER BUCKLE” is adjustable by lifting the central buckle. In order to completely open, lift together both side buckles, or push the center button to sli