A putter whose face points straight up at the sky when you balance the shaft horizontally on your finger. That means the head has no built-in desire to rotate during the stroke, which suits players with a straight-back, straight-through motion — the putter stays square without you manipulating it. Most high-MOI mallets are face balanced, achieved by aligning the shaft axis with the head's center of gravity. It's the opposite end of the spectrum from toe hang: if your stroke has a strong arc, a face-balanced putter can feel like it resists closing and leaves putts pushed right.