Pro Run Cap. Advanced cap for long distance runners and everyone looking for a high-tech sports cap. Created with unique styles and designed for sun protection and breathability during high intensity activities, the Pro Run Cap is designed for comfort and performance. Protection is vital when running in the sun. Made for comfort and performance, the BUFF® Running Caps offer protection against harmful ultraviolet radiation while keeping the sun away from your eyes. Latest technologies and appealing designs get together in ultralight, highly breathable and extremely appealing caps. Design: Solid color. Size: One size. Designed for adults.