Knitted fabrics have been widely used in different fields due to their high strength and elastic properties. However, these can only be used in limited applications due to poor liquid absorption owing to the large pore size of knitted fabrics. This study is focused on the structural characteristics of micro- and nano-filament warp as well as weft knitted fabrics. Nano-filament fabrics are manufactured by means of alkali treatment. Filament diameters are significantly reduced according to SEM micrographs. The decreased porosity of nano-filament fabrics indicates that nano-filament knitted fabrics possess excellent water absorptive capacity due to capillary action in the fabrics. Tensile behaviors of knitted fabrics in the wale and course directions are investigated as well.