Warmth and support for your knees, easy to affix, dimensionally stable, and formed anatomically. Sabona of London support garments adds support and warmth to muscles and joint areas. These elasticized Sabona of London supports have 5% copper thread (Thermal Copper Insulation = TCI) knitted into the fabric. TCI is woven into a special blend of fabrics. The copper in the TCI conducts natural body heat, and as the body warms the copper, it, in turn, retains the heat generated and stores it within the fabric.