ISNTREE Hyaluronic Acid Sun Gel 1.69 fl.oz. SPF 50+, PA++++ blocks UV rays chemically Without having white cast, it's absorbed quickly into skin and its texture is so smooth that it's easy to apply like lotion. Relieves skin irritation As it soothes heated skin and gives elasticity to skin, it helps to improve dull skin as well. What are SPF and PA? SPF 50+ : SPF means the percentage of blocking UV-B, which causes skin inflammation and burns skin. The higher the number is, the stronger the ability of blocking UV-B. PA++++ : UV-A lowers skin elasticity and penetrates deeply into skin, and PA blocks UV-B. Recommended to those... Who want to protect their skin which tends to be dry in winter. Who is worried about strong UV rays during outdoor acitivites. Who want less stiff texture of sunscreen