Semi-sheer tights developed with Sheertex® patented rip-resist technology that provides long-lasting durability. Ultra strong, yet soft and comfortable on skin. Wide, elasticized waistband for extra support and a comfortable, adaptable fit through the different stages of pregnancy. Similar to 40 denier. If you notice lines in your tights, it may be due to the fibers being unevenly gathered and twisted. To smooth the fabric, firmly pull on both sides of the line and gently massage the area.