When evaluating cotton mesh, prioritize the GSM (Grams per Square Meter), which typically ranges from 80g to 250g depending on the application (e.g., lightweight for produce bags vs. heavyweight for apparel). You must also verify the mesh hole size and shape (hexagonal, diamond, or square) to ensure it meets your specific breathability and aesthetic requirements. For B2B buyers, ensuring the fabric is combed cotton rather than carded cotton is vital for reducing pilling and increasing tensile strength.