100% Made in USA from organic cotton. Follow these cleaning instructions to extend the life of your CoffeeSock reusable organic cotton coffee filter: - Compost your grounds (great for your soil) - Turn your sock inside out and rinse with hot water. - Squeeze out excess water, and hang up to dry thoroughly between uses. This is all the cleaning that is necessary with ordinary use. To further sanitize occasionally, or as necessary - Boil for 5 minutes - Or run through your dishwasher - Or soak in water and microwave on high Visit Cuppow.com for more great products.