The Zefiro is a fixed bed base which, thanks to the special PBS® (Pressure Balance System), adapts to the user’s body, balancing out its various pressure points via a mechanical system.The system of opposing thrusts guarantees total comfort.PBS® uses the scientific pressure balance principle. All pressure exerted is immediately and evenly balanced. With this pressure alleviated, the user can lie back in complete relaxation. Mattress that goes with Zefiro bed base: Filicudi