Rare Beauty Foundation Brush

I've gone through so many different tools for foundation application, from BeautyBlenders, BeautyBlender dupes, nondescript brushes, and pricier Bobbi Brown brushes, but this one takes the cake.

I don't know exactly why it's so good (the shape? The density of the bristles? Wizard magic?), but this has worked well with serumy foundation, creamy stick foundations, and self-setting foundations alike. It's never been streaky for me, either. I also get eczema flareups every now and then, and it goes over leftover dry patches like no problem. Love.