Which part of the curl allows for movement and flexibility?

The part of the curl that allows for movement and flexibility is the stem. The stem refers to the section of hair between the base and the curl's end. It is crucial because it determines how much movement the curl will have. A longer stem allows for more flexibility and movement of the curl, which can create a more natural look and allow for various styling options.

Understanding the role of the stem in curl formation is key for hairstylists when creating different looks. It enables them to control the degree of curliness and the way the hair moves, which is essential in achieving the desired hairstyle. The base, on the other hand, is where the curl begins, and the ends of the hair influence the curl's shape, but it is the stem that primarily provides the flexibility and movement.