Organic cotton is made from cotton that is organically grown. Even though organic cotton is better than regular cotton, because no or very little pesticides are used, there are still considerable environmental problems associated with cotton:

On a worldwide average 10.000 litres of water are use to produce 1 kg of cotton, for organic cotton specifically this figure is even higher because the yield is lower
Fertile farming land is used to produce cotton approximately 10 m2/kg
Cotton is much less durable than polyester and therefore the lifetime is less than half, which gives a higher amount of waste.
Cotton dries much slower than polyester, so whereas a Safepanty will dry in as little as 30 minutes, a comparable pad made from cotton could easily take 24 hours to be properly dried
Organic cotton panties may absorb a large amount of menstrual fluid. Nevertheless, organic cotton panties may absorb the fluid slower, so even though the organic cotton pad absorbs more, the user might feel a need of changing it more often.
Blood stains are quite difficult to remove from cotton fabrics as compared to polyester. This will cause the users to discard the cotton pads even earlier. Safepanty even has a stain release treatment, that will make it even easier to wash.

Safepanty™ is made from polyester fabric with a high and immediate absorbency that ensures comfort and leakage free periods. The antimicrobial layer is formed from silica, nitrogen, and carbon. The antimicrobial technology offers an infection free period.