Sheer 15 denier leg. Nylon / Lycra, 15 Denier /Flawless Finish. All other Styles, Sizes and Colours have a Standard Double Welt. Knitted backseam effect French/Point Heel and reinforced foot. The Extra Long And Large Size Black/Black Seam, Nude/Black Seam and the Black/Red Seam have a Deep Double Welt.