physical sunscreen, differs from chemical one which absorbs Ultra Violet, this physical can reflect UV, safer and less likely to get allergy. But for most of the physical sunscreen, the disadvantage of it is that generally it’s thick and not so easy to apply on skin, but we use this nano-size titanium dioxide,the particles are very small that pores will not be clogged ,besides when the diameter of titanium dioxide particles is less than or equal to half of the wavelength of UV, and this weights 30-85 nanometers, way shorter than half of the UV wavelength 190nm-400nm, the reflection to UV will reach the maximum, it can reflect both UVA and UVB. What’s more, the jojoba ester can moisture skin make it less tight and dry.