What is VCI? How does it relate to shoe support and cushion?
The Vertical Compression Index (VCI) is measurement of shoe stability through the hindfoot portion of the shoe and is measured in millimeters (mm). VCI is measured through compression of the heel portion of the shoe under a fixed amount of pressure, thereby measuring how the structure of the shoe controls calcaneal (heel) deviation and rearfoot motion. Once compressed, the distance that the shoe has been depressed is recorded as the VCI. A higher VCI generally indicates that a shoe is soft in the heel area, corresponding to a greater cushioning effect, but less control of heel motion. A lower VCI indicates greater firmness and hindfoot stability in a shoe, and subsequently increased control of rearfoot motion.
