When evaluating waffle fabric, you must prioritize GSM (Grams per Square Meter), typically ranging from 180 to 350 GSM depending on the intended use (lightweight tees vs. heavy robes). Pay close attention to the material composition, such as 100% Cotton, Cotton-Polyester blends, or Rayon/Spandex mixes, as these dictate the fabric's breathability and elasticity. Additionally, verify the shrinkage rate, which should ideally be under 5% for high-quality knits, and check the colorfastness rating (Grade 3-4 minimum) to ensure the honeycomb texture retains its dye after multiple washes.