Absorbs sweat from forehead, keeping your hats nice! No Sweat Hat liner will work in a number of types of Hats. Most commonly used in Baseball caps & golf hats, but also works on straw hats or other type and is a disposable Liner. The liner sticks on the inside of ANY hat or cap and soaks up sweat so you do not have sweat dripping down onto your face and into your eyes or glasses while you are in the sun. NoSweat liners also helps you keep sweat stains off of your favorite hats. The amazing technology these are made with not only help prevent stains but also eliminates odors, keeping you and your hat Fresher Longer. They are comfortable -- Thin, soft, and lightweight. They are Hypoallergenic -- which may Help prevent acne & skin irritation. They are 100% AMERICAN MADE.