tasteetaste Because 1" X 1" of cloth requires 130 count yarn as opposed to say 100 count yarn which means that the 100 count yard (thread) is 30% thicker (bulkier) which means that since yarn is 3 dimensional, the yardage will have to be 30% bulkier. Bulk is weight. The bulkier that the cloth is, the heavier the yardage will be. Do you follow the logic?