Sonia G Detail Pro is a brush.
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Sonia G Detail Pro Brush ($TBA) is a small face brush or mega-sized eye brush (depending on how you look at it) made out of dyed and undyed goat hair. The brand explained that dyed goat hair tends to pick up product better, but by adding undyed hair (and making it a blend of hair) gives it "enough grip" to work with stiffer powder products while giving a more buildable application. This is something I have found true with other brushes I have that use a mix of hair; they're a bit more resilient, hold their shape a little better, and tend pick up product better than ultra-soft white goat hair brushes do.
It looks like a giant crease brush (for eyes) to me; it flares out slightly from the ferrule with a fluffy, rounded edge. The brush is beautifully soft and smooth against my skin, and the brush head feels like one as I maneuvered the brush in circles and soft strokes. The brush is designed to for setting product on areas like eyelids or for more precise sculpting. For me, it is a brush I'm not sure I'll reach for often, so I'm curious to see if I change my mind over time, but it's not one I have replicated across my stash in other brands on purpose.
I could see it working well to get very precise placement of highlight on the nose, cheekbones, and cupid's bow or to gently diffuse concealer underneath the eye or set underneath the eye. I was thinning that it might be particularly good with more glittery highlighters or loose highlighters to control the initial laydown; even seeing it work well for applying less traditional highlighting shades to layer and add dimension without feeling like it takes over.
You can think about this brush as a chubby crease/blender type of brush in terms of shape but it's not really for crease definition. This is to precisely set [the lids or other areas of the face], to sculpt, to “paint” with powder products. It was all about a small versatile tool that had to easily fit in eyeshadow pans so that we could work with any eyeshadow onto the face... should we wish to! This brush makes you feel like an artist working on a canvas, the whole experience is an absolute treat and it’s also very special to me as this is the brush I will for sure use daily to set my lids or specific small areas.