Available in 3 Volumes: HV (High Volume, thickest), MV (Medium Volume), and LV (Low Volume, thinnest), to accommodate a range of shell fits and providing superior custom fit and comfort. These lace up, tongue style liners are constructed with a dual-density foam lay-up, feature a roomy toe box for maximum wiggle room, and a thick high-density sole that can be worn with or without additional footbeds.