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Low-power reflected-light stereozoom microscope images of FG-3 mattress subsamples acquired at 10×. (a) White, synthetic, woven outer cover material from top side of mattress. (b) Beige outer cover material from bottom side of mattress consisting of synthetic fibers in polymeric binder. (c) Inner sock material, showing woven threads, each uniformly wrapped in white synthetic fibers. (d) Same as (c), but inner fiberglass core revealed inside each thread.
