JAR SIZE: fitted specifically for 16oz normal and wide mouth Mason Jars. FUNCTION: Absorbs messy condensation, Protects Jars! Keeps warm drinks warm and cold drinks cold. STYLE: Choose from many styles! MACHINE WASHABLE – Just throw it in the washer or rinse in the sink for an easy clean. SATISFACTION: Our KOVERZ products are made with the highest quality to last for years. If you aren’t satisfied, return for a refund or replacement.