Kapok fiber is finer than cotton, with shorter hollow strands making it ideal for filling yoga bolsters, body and pregnancy pillows, cushions, doonas & mattresses, neck and lumbar rolls and lounge chair or meditation cushions. Because of the water resistant (thus, kapok fiber is does not absorb perspiration) properties of kapok you can quickly sponge away any spillages. Kapok products will 'fluff up' by being placed in sunlight. Hypoallergenic and mould resistant with its own anti-bacterial properties. Kapok is an ideal option for those wishing to live lightly on the planet.
Other than those benefits of kapok fiber, you will also get a firm and malleable mattresses by using kapok fiber as the filler material.