Mammut runbold pro cap the runbold pro cap is an extremely light and quick drying cap for mountain activities side ventilation openings help you stay cool even in the height of summer the size can be adjusted using a clasp specifications weight g 50 light and fast drying pre shaped brim ventilation holes for optimum breathability buckle closure for individual adjustment ideal for walking trail running main fabric polyester fabric upf 30 composition outer material 100 p