A treated textile material comprising: (a) a textile substrate having a first surface and comprising a plurality of first yarns and a plurality of second yarns, the plurality of first yarns being disposed in a first direction in the textile substrate, the plurality of second yarns being disposed in a second direction perpendicular to the first direction, the plurality of first yarns and the plurality of second yarns being interwoven, the first yarns and second yarns each comprising ≥ 90 wt.% of staple fibers selected from inherent flame-resistant fibers, the textile substrate having an areal density of ≥ 150 g/m 2 and an optical transparency of ≤ 10%; the optical transparency being measured by - backlighting a sample of the textile material on a uniform backlight sample stage positioned in the line of sight of an optical microscope equipped with a digital camera, - focusing the optical microscope on an area of the textile material measuring approximately 5x5 cm (2x2 in) and capturing an image of the area at a resolution of ≥ 1200 dots per inch (dpi), - converting the captured image to a grayscale image and applying a threshold filter to flatten the image to a binary pixel map, setting the threshold filter to identify illuminated versus dark pixels using a threshold of 50% of the total intensity, and - taking the percentage of illuminated pixels in the image as the optical transparency; and (b) disposed on the first yarns and the second yarns, a finish comprising a fluorochemical repellent and being present on the textile material in an amount of ≥ 0.05 g of fluorochemical repellent per g of the textile substrate, wherein the fluorochemical repellent is a copolymer comprising perfluorinated acrylate monomers. (a) a textile substrate having a first surface and comprising a plurality of first yarns and a plurality of second yarns, the plurality of first yarns being disposed in a first direction in the textile substrate, the plurality of second yarns being disposed in a second direction perpendicular to the first direction, the plurality of first yarns and the plurality of second yarns being interwoven, the first yarns and second yarns each comprising ≥ 90 wt.% of staple fibers selected from inherent flame-resistant fibers, the textile substrate having an areal density of ≥ 150 g/m 2 and an optical transparency of ≤ 10%; the optical transparency being measured by - backlighting a sample of the textile material on a uniform backlight sample stage positioned in the line of sight of an optical microscope equipped with a digital camera, - focusing the optical microscope on an area of the textile material measuring approximately 5x5 cm (2x2 in) and capturing an image of the area at a resolution of ≥ 1200 dots per inch (dpi), - converting the captured image to a grayscale image and applying a threshold filter to flatten the image to a binary pixel map, setting the threshold filter to identify illuminated versus dark pixels using a threshold of 50% of the total intensity, and - taking the percentage of illuminated pixels in the image as the optical transparency; and - backlighting a sample of the textile material on a uniform backlight sample stage positioned in the line of sight of an optical microscope equipped with a digital camera, - focusing the optical microscope on an area of the textile material measuring approximately 5x5 cm (2x2 in) and capturing an image of the area at a resolution of ≥ 1200 dots per inch (dpi), - converting the captured image to a grayscale image and applying a threshold filter to flatten the image to a binary pixel map, setting the threshold filter to identify illuminated versus dark pixels using a threshold of 50% of the total intensity, and - taking the percentage of illuminated pixels in the image as the optical transparency; and (b) disposed on the first yarns and the second yarns, a finish comprising a fluorochemical repellent and being present on the textile material in an amount of ≥ 0.05 g of fluorochemical repellent per g of the textile substrate, wherein the fluorochemical repellent is a copolymer comprising perfluorinated acrylate monomers.