Our under-the-foot boot board, or “zeppa,” offers a unique biomechanical design with a 3mm foam strip down the length of the inside of the foot (ball of foot), enabling the big toe to drop down. When initiating a turn, your shifting body weight compresses the foam, allowing the ball of the foot to naturally articulate. Like a dimmer switch, this provides sensitive edge control to the skis, less fatigue to the skier and greater power for carving turns.