These semi-opaque black tights are specially constructed to accommodate an expecting parent's growing belly, thanks to its ultra stretch nylon and extra fabric at the waistband. *Not sure what size to get in maternity wear? Opt for your usual size, we design the garments in accordance with it and your changing body during pregnancy. If you've gained a considerable amount of weight during your pregnancy or are expecting twins, we suggest going up a size. - Stretch nylon fabric - 60 deniers opacity Size Chart: S/M - Height of 4'11" to 5'4" (1m49 - 1m62) and weight of 95 to 130 lbs (43 - 31 kg) M/L - Height of 5'4" to 5'10" (1m63 - 1m78) and weight of 110 to 178 lbs (50 - 78 kg) L/XL - Height of 5'6" to 6'0" (1m65 - 1m85) and weight of 160 to 235 lbs (72 - 106 kg)