Out of the entire range of brushes, my favourite one would have to be the 101 Triangle Foundation Brush. This brush is just honestly like nothing I've ever tried before. On one side of the brush you have a flat surface to apply your foundation to obviously the flatter areas of your face. The other side is where the magic comes in. Being angled, you can easily either contour or apply foundation to the more stubborn areas like around your nose. For me, I like to use this foundation brush as a starting point to apply my foundation, however because I am forever in the 'beauty blender cult', I finish up with patting down and blending everything in with my beauty blender.