When sourcing cotton cone thread, the Yarn Count (e.g., 20s, 40s, 60s) is the most critical metric; a higher number indicates a finer thread. You must verify the Tensile Strength (Tenacity) to ensure it can withstand high-speed industrial sewing machines without breaking. Additionally, check the Twist Direction (S or Z twist)—Z twist is standard for most single-needle machines. For premium applications, prioritize Combed Cotton over Carded Cotton, as it offers superior smoothness and significantly lower pilling and lint levels.