The difference between a medium hold and a flexible hold lies in the degree of control they offer. Medium hold hair spray provides a moderate level of control and is suitable for hairstyles that require some structure but still have some movement.
On the other hand, a flexible hold hairspray, like the Goldie Locks Flexible Hold Hair Spray, offers a gentler hold that allows for more movement and adjustability throughout the day. It's perfect for maintaining a natural-looking style and offers the advantage of being buildable, so you can adjust the level of hold as needed.