This category is new and recently introduced in the market. The hair is embedded in polyurethane tape that resembles skin. These wefts are then installed using a special adhesive tape. THICKNESS- A single weft means that there is only one line of hair sewn onto one mesh, whilst double weft -hair extensions means that there are two single wefts sewn together on one mesh of hair. Meanwhile, a triple weft and quad weft have triple or quadruple the amount of hair sewn onto one mesh.