All the variants namely Heavy and Ultra are made of cotton, look and feel the same. The GoPadFree Heavy absorbs upto 5 times more of regular sanitary pads and GoPadFree Ultra absorbs upto 6 times more of regular sanitary pads. This difference in absorbency has been achieved by changing the fabric composition and the number of super absorbent layers stitched inside the crotch area. Rest all remains the same!