Most parents prefer the BREATHABLE polyester diaper covers because they are very durable even though they are lightweight. Breathable covers allow air circulation, so body heat and humidity do not accumulate inside the diaper.
If you prefer to have only natural fibers next to your baby, you will like the cotton diaper covers, which are NATURAL AND BREATHABLE.
Parents choose wool diaper covers because it is NATURALLY WATERPROOF (no waterproof layer is put on it). If your baby is a heavy wetter at night, the wool diaper covers are best because they will actually absorb some of the moisture from the diaper, without feeling wet. (This is the reason fishermen use wool gloves--wool is the most comfortable fibre in wet conditions!) Wool is the most popular diaper cover style in some parts of the world (Japan, for example). The wool pants are not “hot”, contrary to popular opinion.

How velcro-closing diaper covers make diapering easier:
*NO PINS NEEDED ON flat or prefold diapers, just lay diaper in diaper cover and fasten Velcro.
*BREATHABLE to help prevent diaper rash.
*WON’T TEAR or get brittle or tear like plastic—you don’t need to keep replacing them.
*COMFORTABLE FIT, do not leave red marks on baby’s skin or irritate navel on newborn. Adjustable fit means you can save money by skipping sizes.
*LESS LEAKAGE--some parents even use diaper covers over disposable diapers to prevent leaks.Double-soft leg bands prevent leakage.

The video below shows how the Organic Wool Sprinkles Diaper Cover works: