What does the arc in a curl affect the most?

The size of the curl is primarily influenced by the arc in a curl because the arc determines how tightly or loosely the hair is wrapped around the curling tool or roller. When you create a larger arc, the resulting curl will be softer and larger, while a tighter arc produces smaller, more defined curls. This principle is essential in hairstyling, as it allows stylists to customize the look of curls to suit various styles and client preferences.

While the other factors, such as texture, direction, and volume, can also play a role in the overall style, the arc is specifically what dictates the size of the curl. For instance, the direction of the curl is influenced by how the hair is rolled, but the size itself is determined more by the arc created during the curling process.