The MECCA view:
This brush has been designed to softly apply and diffuse eyeshadow to the lid and eye socket. It features ultra-soft, rounded edges that will cut your blending time in half. Use the brush on its full width to create a sheer wash of colour over the lids, or pack on shadow. Use the thinner profile to work shadow through the socket or under the eye.   

Pair it with:
Nars Single Eyeshadow
Surratt Beauty Artistique Eyeshadow
Nars Eyeshadow Duo