builtcool mesh cooling baseball hat - moisture wicking ball cap for hot weather, running, tennis, and golf safety yellow builtcool the builtcool adult baseball hat is a great choice to stay cool while being active during the summer months. any outdoor lover will appreciate the ability to regulate their body temperature while using a ball cap in their favorite color.<br><br> builtcool is designed to have a cooling outcome with moisture wicking technology. simply soak the fabric until damp, wring it out, and snap it to activate its effects. the fabric cools up to 30 degrees below your body temperature. when the cooling wears off, just re-soak and snap to re-activate. <br><br> perspiration activates the cooling molecules as they begin to swell. for maximum and prolonged cooling, completely <b> wet, wring and snap.</b>