Microfiber. It's been called the 'Miracle Cleaning Cloth'! You can't wear it out. It scrubs, it polishes. It absorbs more liquid than any sponge and drys super-fast. And, because Microfiber is so soft and lint-free, it's used by all types of vehicle owners: RV, car, truck, motorcycle....It's ideal for interior cleaning as well as exterior including windows and tires!