These tights are made from a special blend of fibres designed to keep you warmer when the weather gets chilly. These black opaque tights are a style must-have. These Heatgen tights are made from a special fibre designed to keep you warmer when the weather gets chilly. ,Style: Added stretch,Care and composition: Composition: 46% polyester, 30% acrylic, 18% viscose and 6% elastane, Care instructions: Machine washable