Foam hair curlers are cylindrical-shaped, porous styling tools made of a lightweight, water-absorbent material such as polyurethane. They are commonly used to achieve defined curls or waves in hair without applying heat.
Foam hair curlers offer a gentler alternative to heat styling, as they do not damage hair. They are also easily adjustable to create different curl sizes and styles. Some foam hair curlers have a flexible wire core that allows them to be bent and shaped to fit comfortably on the head.