Keep your tumbler clean, protected, and spill-free with this leak-proof silicone straw cover designed for 40oz tumblers.Built for everyday use, this reusable straw cover helps prevent messes while protecting your drink safe from dust, dirt, and germs. ✔ Key Features Leak-proof seal helps prevent spills, splashes, and leaks Protective design keeps straws clean from dust, dirt, and germs Durable food-grade silicone for long-lasting daily use Reusable and easy to clean – simply rinse or wash Snug, secure fit designed for most 40oz tumbler straws (10-12mm) Magnetic attachment allows the cap to stay connected when not in use ✔ Perfect For Travel and commuting Gym sessions and outdoor activities Work, school, and daily hydration Keeping drinks clean on the go ✔ Compatibility Designed to fit most 10–12mm straws, commonly used in 40oz tumblers and similar large drinkware. ✔ Why You’ll Love It This silicone straw cover is a simple upgrade that makes a big difference—keeping your tumbler cleaner, reducing spills, and adding convenience wherever you go. Fits most 10–12mm straws used in 40oz tumblers, including popular insulated tumblers for everyday hydration and travel. Pair with a tumbler:Shop our 40oz insulated tumblers with handle for the perfect match.