1. A MATTRESS COMPRISING A TOP BORDER WIRE, A BOTTOM BORDER WIRE SPACED FROM SAID TOP BORDER WIRE, A CENTER WIRE BETWEEN SAID TOP BORDER WIRE AND SAID BOTTOM BORDER WIRE, HELICAL SUPPORT SRINGS EACH HAVING ITS LOWER END DISPOSED GENERALLY IN A PLANE WITH SAID BOTTOM BORDER WIRE AND ITS TOP DISPOSED IN A COMMON PLANE WITH SAID TOP BORDER WIRE, SAID BORDER WIRES BEING IN THE FORM OF LOOPS TANGENT TO THE TURNS OF SAID HELICAL SPRINGS, SAID CENTER WIRE BEING IN THE FORM OF A LOOP SLIGHTLY SMALLER THAN SAID LOOP DEFINED BY SAID TOP AND SAID BOTTOM BORDER WIRES,