Physio Air creates maximum ventilation and maximum freshness with multiple holes designed for maximum airflow; to keep babies sensitive skin dry and free to breath. Ergonomic shape:the soother contours to baby’s face, ensuring the correct space for chin and nose. Rounded edges: for a gentle touch on baby’s skin. Leaves the correct space between baby’s chin and nose, with safety ring. For improved air flow, leaving the skin free to breathe. The soother sits gently on baby’s face in a rounded shape, preventing irritation to baby’s skin.