FIT PROFILE: Medium volume / Medium profile (Volume refers to the amount of space the insole will take up in your shoe. Profile is how much shape you can expect to feel under your foot) REINFORCED STABILIZER CAP: the base of the insole that supports the rearfoot and provides structure and stability to the foam layer DEEP HEEL CUP: features a deep, narrow heel cup that helps support the foot during high-impact activities and long distances