The present invention is a yarn or fabric useful in protective garments. The yarn or fabric is made of flame resistant fibers and microdenier flame resistant fibers. The flame resistant fibers are selected from the group consisting of inherently flame resistant fibers, treated fibers, and combinations thereof. The microdenier flame resistant fibers are selected from the group consisting of microdenier inherently flame resistant fibers, microdenier treated fibers, and combinations thereof. The weight ratio of said flame resistant fibers to said microdenier flame resistant fibers is in the range of 4-9:2-6.
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