I believe this was a promotional item for Otsuka Pharmaceutical's sports drink, Energen. It's a white cap featuring an embroidered logo. - Brand: Energen - Color: White - Size: Free, adjustable - Material: 100% cotton - Design: Embroidered logo - Condition: It has been used to some extent, but it's in good condition with no loose threads in the embroidery. It has been washed in a laundry net. There is a slight brown stain around the top button, likely from rust on the metal.