Sonia G Crease One is a brush that retails for $38.00.
Sonia G. Crease One Brush ($38.00) is a smaller, very tapered crease brush that comes to a more prominent point. It is made out of blue squirrel hair and was designed to both deposit and blend out products with more targeted intensity. For the hair type, it actually didn't feel quite as silky and smooth as I'd expect, though it was certainly soft and never scratchy.
As I've tried it with numerous brands and formulas over the last year, I enjoy the size for more precise, detailed crease work, especially for depositing intense color into the deeper part of my crease, it's doesn't consistently diffuse and blend out products as well as I'd like (given it is supposed to do both). More blendable eyeshadows tended to diffuse well with the edge of the Crease One brush, but firmer, stiffer, and more intense shades needed something more rounded, a bit fluffier to really pull and diffuse the edges outward. I prefer the more rounded shape of Crease Two for getting better, more consistent blending across a myriad of products (at all different colors, finishes, and quality levels!) but would love to see a smaller version. (Crease Pro is smaller but still a little wide just before it tapers in, and it has a stronger point.)
Per the brand, the handle has a total length of 154mm with a brush head length of 14mm and width of 7.3mm. As part of the core range, the handles are wider than average (the PRO range has thinner, more tapered handles). You can safely assume that the brush has held up beautifully over many washings and uses; if there are any issues from washing, shape changes, and the like, they'll be called out specifically.
Designed to conform with the curves of the eye, this velvety-soft crease brush offers targeted application into the crease of the eye without scratching delicate skin. The dense natural bristles blend and soften as you go so you’ll never leave behind harsh edges. “I wanted to design a crease brush that would target intensity where I need it. It's pointy, but the sides and tip are dense, so it does a great job at depositing and blending pigment.” — Sonia G.