What is 40 denier in tights?

Forty denier in tights refers to the thickness of the fabric, with "denier" being a unit of measurement used to indicate the density of the fibers. A 40 denier tight is considered medium-weight, providing a balance between opacity and breathability. This thickness offers decent coverage while still being suitable for transitional seasons, making it a popular choice for everyday wear. Typically, 40 denier tights can be semi-opaque, allowing some skin tone to show through.