Gore Tenara Thread M1003-MTR-BK-5 offers 1850 Denier black 8-oz heavyweight performance in a new, improved three ply Tenara sewing thread design that's easier to sew. This PTFE marine grade thread stands up to UV rays, saltwater, and weather extremes, keeping outdoor upholstery seams strong for patio upgrades that endure sun and storms. Unlike typical threads, its high tenacity construction outlasts fabrics, delivering weatherproof reliability in black Tenara thread for marine and outdoor projects.