Power Wrap + hvPOWER WRAP PLUS liners are the same thickness through the foot as the original Power Wrap but have an extra thick cuff wrap reinforcement intended to stiffen and fill up over sized shells, especially for those with narrow heels and thin calves. The high density, thick, wrap style liner provides maximum stiffness and heel hold, while increasing warmth, comfort and performance. The Power Wrap Plus is a high volume liner and works best with a shell fit*