Therapy Systems Sun Rays SPF 20 ($28.00) is a mineral blush/bronzer with mica, boron nitride, and silk. They are incredibly finely milled, and they blend into the skin effortlessly because they go on so smoothly. Sun Rays is more like a bronzer, and since it’s a powder, you can build up the intensity of the pigmentation to the level you desire. I personally found this applied best using a buffer brush or a very fluffy powder brush, as well.