heat treated stabilized polymeric fibers or pitch based fibers application_number US 20663688 A description in accordance with the invention it has been surprisingly discovered that a foamed seat cushion can be provided with a non woven covering comprising carbonaceous polymeric fibers having an loi value of greater than 40 which are intimately blended with a suitable binder which provides a synergistic improvement in the fire retarding and fire blocking characteristics of the resulting structure even more significant results are achieved when the carbonaceous fibers are non linear fibers have a reversible deflection ratio of greater than 1 2 1 and an aspect ratio 1 d greater than 10 1 both the linear and non linear fibers can be utilized in connection with the present invention when the carbonaceous fibers are non linear the gap between the fibers provides the porosity in the event of fire which suppresses smoldering it is understood that the greater the amount of non linear carbonaceous fibers which are utilized the better will be the reforming and fire retarding characteristics of the structure the non linear carbonaceous fibers which are utilized may have a sinusoidal and or a coil like configuration depending upon the ultimate use of the fibers the acrylic derived carbonaceous fibers have a nitrogen content in which the nitrogen content is between 18 and 20 are especially useful for fabrics making skin contact with the wearer the fabrics may comprise a blend of all natural all synthetic or a combination of both together with the carbonaceous fibers the natural fibers wherein the synergistic effect is found when used in a blend with the carbonacecus fibers of the invention include cotton wool flax and silk the synthetic fibers which can be utilized to.