The M.A.C. 182 kabuki brush.
My favorite brush. Not only could i go on for days about how soft and full the brush feels on your face, but the quality and versatility of this brush is amazing. Need to put on a tinted moisturizer? Need to set your liquid foundation with powder? Apply a powder with coverage with no foundation? This brush does the trick.
Warning: It is so soft, i often find myself swirling it on my face for much longer than needed. Which blends out my product too much and i need to use more, which wastes in the long run. Keep track of yourself while using it.