When shopping for luxury linens, most people fixate on thread count—but that's not the whole story. As a family-owned Italian linen manufacturer with 90 years of expertise, CASTELLO 1935 knows the real secret: mercerization. This specialized process transforms cotton at a molecular level, creating stronger, more lustrous fibers. Our mercerized cotton offers a 250-wash cycle guarantee—2.5 times the industry standard. Discover why thread count misleads and what truly matters in