Emulsions 
The form of the product undoubtedly influences its sensory properties and ease of application onto the skin. Oil-in-water (O/W) emulsions are usually lighter and feel more pleasant, but water-in-oil (W/O) systems are characterised by greater water resistance, which is a significant advantage for sunscreen products. 


To counter the heavier feel of W/O systems, silicones are often used in the continuous phase of the emulsion as they provide a silky feel. They also improve the even distribution of the cream on the surface of the skin, contributing to a higher SPF value. Thanks to a new emulsifying system based on a blend of polyglyceryl-4 isostearate, coco-caprylate/caprate, and disteardimonium hectorite, it is possible to obtain natural W/O emulsions with extremely light textures, similar to that of water-in-silicone emulsions.2 The emulsifier achieves this by promoting the formation of large droplets in the internal aqueous phase, giving a lighter, fresher feel than traditional W/O emulsifiers. 



source from https://www.personalcaremagazine.com