OTSO caps are ultra-light, very comfortable, and above all, very breathable, as their entire back and sides are perforated for proper air circulation. Additionally, they fit perfectly to any head thanks to their elastic around the entire lower contour, without the need for any buckle, velcro, or similar closure, thus avoiding any type of chafing. They can be used both for daily wear and during any outdoor activity. MAIN FEATURES * Made in China. * Breathable * Super light * 100% Polyester