One of my favorite makeup brushes are Sigma brushes, because they are more affordable yet are very comparable to MAC and other higher end brushes.
My favorite as of lately has been their F84 Angled Top Kabuki brush, from their Sigmax collection.
This is the perfect brush for blending in foundation and powder with exact precision to the shape of your face. It blends in creams, powders, and liquids like a dream and effortlessly.
I have been using this brush for foundation application for a while now and it just gives me that flawless, and natural look with very little work. Blend and buff at the same time for that beautiful look. The brush is amazing soft, just feels heavenly against your skin. I love that they include the brush guards with their face brushes, because it definitely keeps the bristles protected and keeps it shape.