... use of filling.2,specifications:1D-25D*32-64:D stands for cotton fiber thickness, the larger the number, the more coarse ... , more commonly used 7D 15D cotton ).28-32-51-64:28mm, 32mm staple fiber (such as 7D*32 ) for machine: 51mm, 64mm ... is filled with long fiber ( such as 15D*64 ), long fiber with good elasticity, can use the loose cotton ...