If you have options, the BEST material to use would be a high thread count 100% cotton fabric. In the sewing community, this would be quilters cotton and flannel. A layer of cotton stacked with a layer of flannel is a great combo. Typically a cheaper cotton will be thinner and the weave between the fibers will be further apart. You can feel the cheaper quality and it will allow more light to pass through if you hold it up to a window. More light = more particles getting through.