Tyvek is a unique non-woven material made of high-density polyethylene (HDPE) fibers. When sourcing, you must distinguish between 'Hard Structure' (e.g., Type 10), which is paper-like and ideal for packaging or envelopes, and 'Soft Structure' (e.g., Type 14), which is fabric-like and used for protective apparel. Key metrics include basis weight (gsm), thickness, and tensile strength. For medical or industrial use, ensure the material offers a high microbial barrier and breathability while remaining water-resistant and tear-proof.