The best watercolor brushes are designed to hold and release water and pigment evenly, allowing for smooth, controlled strokes. High-quality brushes often feature natural hair, such as sable, or synthetic fibers that mimic its performance. Key types include round brushes for detail work, flat brushes for washes, and filbert brushes for soft, blended edges. Look for brushes with a good point, spring, and durability. Popular brands like Winsor & Newton, Escoda, and Princeton offer top-rated options.