Good quality umbrellas, if the term is used to rain, as affected by rain in the impact of acidic and alkaline substances, but also make the coating aging, reduce the quality of the umbrella of the sun. Poor quality of the umbrella, the next heavy rain, the sun protection coating off, however, is likely to lead sunscreen coating is destroyed. Therefore, unless it is an emergency, or peacetime conditions, or prepare two umbrella, a sun an rain. 
 In general, should carefully review before purchasing protection grade mark. AQSIQ promulgated "Performance Evaluation of UV textiles," provides that only UPF (ultraviolet protection factor values) greater than 30, and the UVA (ultraviolet) transmittance less than 5%, can be called anti-UV products , protection class standards "UPF30 +"; when the UPF is greater than 50, showed excellent performance UV protection product, protection class marked as "UPF50 +". Consumers in the purchase, should carefully review the protection flag, and then the sun according to the local circumstances, to buy for their own umbrella.