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Fiber mass containing fused contact points is typically produced by the heat-treatment on card web containing a certain amount of fusible fiber under a suitable uniaxial pressure. As a fabric form, it is often called as 'thermal bonded non-woven fabric'. There is also a close similarity in structure between tis type of fiber mass and non-woven fabric bonded by binder. Such fiber mass has been widely used for diapers. Recently it has been utilized also as cushion material, because of its environmental friendliness and comfortability caused from its good water vapor permeation. In this paper, a non-woven having PET hollow staple fiber (13.9 dtex) as main constituent was tested for its compression properties. The compressional characteristics in the machine (X-axis) and width (Y-axis) were investigated in comparison with those in thickness (Z-axis) direction of web. It was found that the compressional behavior in X- and Y-axis direction is much different from the Z-axial one and is similar to the behavior of polyurethane foam. Their mechanisms of compression deformation can be modeled by an anisotropic cell structure, whereas the Z-axial curve can be approximately explained by loose fiber-contact mass.