When evaluating hair fabric (often referring to faux fur, hair-on-hide, or specialized textile blends), you must prioritize fiber composition (e.g., acrylic, polyester, or modacrylic for flame retardancy). Pay close attention to pile height (ranging from short 5mm to long 100mm+) and GSM (Grams per Square Meter); a higher GSM typically indicates a denser, more luxurious feel and better durability. For high-end applications, ensure the backing fabric is reinforced to prevent shedding and stretching.