Here's my current favorite eye shadow brush. Chanel #12 is a crease/blending brush of the perfect size, weight and density, while also soft and fluffy, so my sensitive eye area is happy. I've been using it as a multitasker lately, since most of my makeup brushes were (and still are) packed in boxes. In a pinch, the #12 would swipe a highlighter under the brow bone, contour the lid, and of course, blend it all together.
Bottom line: Part of my inner sanctum of makeup items.
Chanel #12 Contour Shadow Brush ($28) is available from chanel.com and most decent department stores. I bought mine at Bergdorf Goodman.
Photos by me.