Elastic jar covers designed for sourdough and smallbatch fermentation Key benefits Secure, breathable cover: Elastic edge holds the cover in place while allowing airflow needed for fermentation and preventing insects and dust from entering. Sized for standard starters: Fits jar mouths 3 to 4 inches (7.6 to 10.2 cm) in diameter — ideal for typical sourdough starter containers. Reusable and easy to care for: Made from a cottonlinen blend that is machine washable and durable, offering a practical alternative to singleuse paper or plastic covers. Pack of six: Six beigecolored covers give you spares for rotation, cleaning, or multiple projects at once. What makes these covers useful Material and performance: The cottonlinen blend provides breathability to support fermentation while remaining sturdy enough for repeated washing and use. Reliable fit: The elasticized rim adapts to slight variations in jar mouth size within the 3–4 inch range, keeping the cover taut without restricting gas exchange. Practical replacement: Swap these in for plastic wrap or loose cloths to reduce waste and maintain a cleaner fermentation environment. Typical uses Sourdough starter care: Keep your starter covered during feedings and rest periods to allow gases to escape while keeping out debris and pests. Smallbatch ferments: Use on jars for kraut, pickles, or other vegetable ferments where airflow is beneficial but contaminants are not. Kitchen prep and storage: Cover jars when draining, straining, or temporarily storing ingredients to maintain cleanliness without trapping moisture. Product details Size compatibility: Designed for jar mouths 3–4 inches in diameter. Material: Cottonlinen blend for breathability and durability. Quantity and color: Set of 6 beige covers. Care: Machine washable and reusable. Practical tips For a secure fit, stretch the elastic gently over the jar rim until it sits snugly. Rotate covers between uses to allow full drying between fermentations and extend fabric life. Wash on a gentle cycle and air dry or tumble dry low to preserve elasticity and fabric texture.