Optional summer sun umbrella tips 8. umbrella in the wet conditions, since the optical conduction of water, UV transmittance increases, the protective effect is reduced. Thus, wet umbrella not for UV protection. Thermometer can measure umbrellas SPF if they want to check the quality of UV umbrella, there is a simple way: a few of the different materials will be stretched in the outdoor advertising umbrella sun umbrella supply, each umbrella inside and outside and put on a same model thermometer, 10 minutes after exposure to sun umbrella, umbrella observed difference between inside and outside of the thermometer, if the thermometer inside and outside the large disparity, indicating the umbrella of insulation, anti-ultraviolet function well, otherwise poor quality. Buy umbrellas tips on how to buy umbrellas Raiders UV coating does not mean there is everything there is to be called anti-UV products customized advertising umbrella, the greater the UPF value, the better the performance of UV. In general, the market most identified as "UPF50 +", its protection has been good enough. Wholesale outdoor umbrella _ FREEMAN outdoor (certified) _ umbrellas provided by the Dongguan City Ltd. FREEMAN outdoor supplies. Dongguan FREEMAN outdoor Ltd. (dg-fm.com) Dongguan, Guangdong, travel, outdoor leaders, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. FREEMAN Outdoor Leadership in the staff warmly welcome all inquiries negotiations to create a better future FREEMAN outdoors.