foaming process the foam bun 10 is cut by water jet laser knife or other suitable cutting tool to form a plurality of c shaped foam bodies 11 which are of the same shape and size the c shaped bodies 11 are typically 1 to 1 u00bd inches 25 38 mm thick but the thickness could be varied as desired the radius of curvature of the cut lines 12 can also vary considerably but may for example be in the range of about 5 to 10 inches 127 254 mm further although the cut lines 12 are preferably circular an elliptical oval or other cut line shape may be used the foam bodies 11 however must be curved as shown to provide the necessary preform for the pad forming method and resulting pad in the indicated cut line pattern on the foam bun 10 there are waste foam trimmings 14 resulting in full semi cylindrical bodies 11 although the foam preforms 11 are substantially semi cylindrical in shape they could also be cut to be shorter in the circumferential direction and or flatter although this would increase the yield and reduce the waste trimmings full semi cylindrical preforms 11 are presently preferred in fig2 there is shown a free standing preform 11 referring also to fig3 and 4 the preform is die cut to form one or more foam pad disks 15 the number of disks 15 that can be cut from a foam preform 11 of course depends on its.