... 4800 low-melting fiber, polyester fiber for raw material. Rigid cotton has very good permeability, elasticity, moisture resistance, comfort, moth, mildew ... used for mattress surface, cushion cotton, tatami mats, sofa cushion cotton, the software sound-absorbing materials, air filtration materials.REMARK:SPECIAL SIZE IS ... CUSTORMER.Please contact me if you need the product. rigid cotton wadding