Works great in traditional golf hats, bucket hats, sun hats, safari hats, straw hats and many other types. Instantly Absorbs/Wicks Sweat: Keeps sweat out of your eyes, safety glasses, safety goggles or protective safety eyewear. Reduces FOGGING: In glasses, half sheilds and eyewear. Sweat Stain Prevention: Helps prevent NASTY Sweat Stains on your headwear. Hat Saver! No Scent Technology: Reduces Odor Patented Universal Design: Sticks inside the front and/or back of any LID Comfortable: Thin, soft, and lightweight. Hypoallergenic: Helps prevent acne & skin irritation