Our quality vinyl pillow covers (Zippered Style) are odorless, waterproof, durable, and virtually noiseless! Zippered covers protect from spills, stains, bedwetting and allergies. Retard mildew, mold and fungi with Ultra-Fresh - an anti-bacterial treatment. Easily wipe clean with a damp cloth. Sold as a pair. 3 Gauge is a unit of measurement that is used to identify the thickness of a vinyl cover. This pillow protector will fit a Standard size pillow.