Cap with roof male under armour iso-chill armourvent strech fit khaki 1383438 390 & nbsp; male hat with roof under armour cheese check during training & oacute; w and daily use daily use. Fashion with NIM POGE. Well yes, to cool head, escort excess heat through special ventilation holes, which they release hot air, but are so much small, that solar rays solar not will will will go get go to A I cause discomfort. & nbsp; technical data: & middot; material: 100% polyester & nbsp; districts: & Middot; S/M: 53-55 cm & middot; m/l: 56-58 cm & middot; l/xl: 59-62 cm & middot; xl/xxl: 63-65 cm & nbsp; & nbsp; & nbsp; & nbsp; & nbsp;