Here is the diaper cover besides a prefold. Insert is a pee absorber fabric sheet that goes inside pocket-diaper. And can be put onto diaper cover if the insert already has a stay dry layer, usually called soaker.
They are made of from highly absorb materials such as cotton, microfiber, terry (towel like fabric), bamboo-fibre, or hemp. Even though these fabrics look thin but it has a great absorption and capacity to hold amount of liquid. These can be used within 3 – 5 hour.
To get more pee capacity, just simply add regular inserts called booster. Flat diaper, a prefold even folded fabric can be utilized as insert but the diaper will look thick and bulky on the bottom area.
Insert, soaker and booster were made in such a way that if already filled with pee, the surface will relatively remain dry or worst case scenario will be a little bit moist, however it still secure for baby’s skin.
Avoid direct contact microfibre with skin surface, it may drought the baby’s skin.