A vest including inflatable tubes or chambers which receive cool air from a blower box. Further, the build-up portion is constituted by a multi-layer build-up substrate in which buid-up portion a peak value of a loss coefficient exists within a range of 100 C. Also a chip package including an alignment device to aid in properly aligning the cover plate on the stiffener is disclosed. A hub fixation screw hole is provided to the other end face of the shaft along the rotational axis.