Do they leak?
What's more, PIMP cloth pads are more absorbent than the disposable menstrual products you´re used to. It's virtually impossible to leak through a pad, provided the nylon has not be damaged by improper care. However if you wear a pad too long, it's possible to leak off the sides. When you first start using PIMPs it´s best to be a little more vigilant about checking your pad. After a few times you´ll be an absorbency pro and will know when to change a pad based on your flow.
*This nylon should not be confused with PUL—Polyurethane laminate. PUL is commonly used in cloth diapering and by many other cloth pad makers, but is not breathable.