Power Transfer, Edge Control and BalanceHalf size trim extension for a perfect fitAnti Friction top fabric with perforations throughout the insole for moisture management system that greatly reduces heat build up that causes blisters and callusesAir flow channels molded into the shape of the insole to move warm air out and draw cooler air into the skate with a upstream to downstream directionHeel air pump absorbs shock and returns energy to the heelDeep contour heel cup provides extreme support, body alignment, shock absorption, and reduce foot fatigueUltra lightweight durable bottom eliminates rivet pressure points and increase foot support and comfortThe lightest engineered insole for your skates