MAC 217 BLENDING BRUSH
If you only ever own one brush, this is the one to have.
I may sound a little crazy getting this excited about a brush but it is amazing! It’s nice and fluffy for perfect blending, gives a sheer wash of colour across the lid and softens any harsh edges- basically does all the work for you- easy peasy. You can also use it for defining the crease with a darker shade of shadow.
There’s a good reason why this brush has achieved cult status and is loved by makeup artists and beauty addicts alike.