When evaluating Shazhou textiles, buyers should focus on yarn count and density, as these determine the fabric's hand-feel and durability. For high-end applications, a thread count of 300-600 is standard. Additionally, verify the GSM (Grams per Square Meter) to ensure the weight aligns with the intended use, whether for lightweight apparel or heavy-duty upholstery. Ensure the supplier uses eco-friendly reactive dyeing to guarantee colorfastness (Grade 4 or higher) and prevent bleeding during washing.