Sonia G Lotus Base is a brush.
Lotus Base is a new, fan-shaped brush with a pinched ferrule, which gives the brush a firmer, denser feel in the center (where the ferrule comes up) and leaves the edges more flexible. It features a mix of sokoho goat, PBT, and PTT synthetic bristles, and it has a hair length of 18mm and total length of 163mm. This brush is new and exclusive (at least, at this time) to the set.
Per the brand, it is designed to apply foundation. The mix of both natural and synthetic bristles helps the brush have more grip and movement while being more durable and less absorbent of any liquids and creams it is used with. The brush head felt smooth against my skin whether I used it more on the edge in a stippling motion or more in a sweeping motion and utilized the sides and edges. It was well-shaped and placed without any shedding.
I'm not sure that it's the brush I'd reach for to apply my foundation, as I tend to prefer something with a more rounded shape that can be patted and buffed with. I could see using this more for sculpting or highlighting with liquid or cream products. The curved nature, but still having some width at the edge, did make it particularly easy to maneuver around my nose, upper lip, between brows and around brows, but I feel like I have to use it a few dozen times to know if it'll be a go-to for foundation.