Sheer tights developed with Sheertex® patented rip-resist technology that provides long-lasting durability. Ultra strong, yet soft and comfortable on skin. Reinforced at top to hold in and shape tummy and thighs. Similar to 30 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.