... Revolution:2400/m Solar Fan CapYC-SC3103MATERIAL: 100% cotton twill or jean,nylon,polyester......BACK CLOSURE: brass , plastic, velcro,metal buckle,any ... ON THE HEAD IN OUTDOOR,THE SOLAR PANEL WILL START WORK AND DRIVE THE FAN,YOU WILL FEEL THE COOL WIND FROM ... THE FAN.SOLR FAN CAP ,SOLAR COOLING CAP,BASEBALL CAPS Baseball Cap With Solar Fan