"Tingulon Nomex Covers are used to protect padding from constant abrasion as the rolls turn tightly against the chests. They protect the linen from the coarseness and irregularities of the padding. They keep dirt from the padding and prevent particles from adhering to the linen being ironed. They hold the padding assembly in proper position. Tingulon Nomex Covers are 9.0 OSY and are 100% woven aramid with a resin coat coating. "