Tenara HTR 138 Black &hellip; Gore Tenara sewing thread stands up to years of sun and weather for seams that will last the lifetime of your product The patented TR style sewing thread has an elongation (or stretch) of approximately 17%, making it more robust, which allows faster sewing. Highly popular CLEAR, provide a translucent thread that disappears into most fabrics, making color matching headaches go away. This thread is unaffected by sunlight. UV radiation will not weaken or degraded. Tenara will outlast the fabric.