When sourcing cotton roll fabric, the primary focus should be on yarn count (e.g., 30s, 40s, 60s) and thread count (TPI), as these directly determine the fabric's fineness and strength. For B2B buyers, it is essential to verify the GSM (Grams per Square Meter) to ensure the weight matches your specific application, whether it be for lightweight apparel or heavy-duty upholstery. Additionally, confirm the weaving method (plain, twill, or sateen) and check for colorfastness to washing and light (Grade 4 or above) to prevent fading in end-products.