Opaque hosiery is made of a denser yarn that is knitted to a greater thickness than sheer hosiery. In opaque pantyhose, tights and knee-highs, color and pattern are prominent. Opaque knee-highs, also called trouser socks, are a great option when you want to add some flair and fashion to trousers or very long skirts. Typically made of a soft microfiber, opaques may be a solid color or may have decorative texture, such as cable. A wide band around the top keeps knee-highs in place without binding. Opaque knee-highs often come in up-to-the-minute colors as well as wardrobe classics like black, brown, navy, gray and nude. Opaque is a great way to diversify your lingerie wardrobe collection.