Whether you prefer full, fluffy brows, a sleek, laminated look or thin, Y2K-inspired arches, eyebrow gel is an essential product for locking any type of brow in place. But if you’re not sure how to use the product, don’t worry — below, we consulted with Melanie Marris, celebrity brow stylist and founder of Brow Code, to find out exactly what eyebrow gel does, how to apply it and how to find your perfect shade and formula.