I have to totally agree with elle.com with their artile on the Sigma Small Duo Fibre being one of the top 12 best makeup brushes. I have personally been using this brush and I feel it is best used for blending out in-between contouring, highlighting and blush.
The F55 Small Duo Fibre features a blend of fibers with an airy flat brush head. This brush works best with powder, cream and liquid products buffed onto the skin for a well-blended and light finish.
You can find this wonderful Sigma F55 Small Duo Fibre brush for only $21 and other wonderful beauty products +Sigma Beauty
Photo credit to SigmaBeauty.com