Which area uses heat to set a design?

• A. Wet design
• B. Thermal design
• C. Texturing design
• D. Color design

Answer: (B)

Thermal design uses heat to set a design. When you apply heat with tools like curling irons, flat irons, or a blow-dryer, the hair's internal bonds are softened and then reform as it cools, locking in the new shape. This makes curls, waves, or a smooth set hold longer than methods that rely on moisture or texture alone. Wet design relies on moisture to shape hair, not heat. Texturing design alters the surface texture with cutting or tools, not by heat setting. Color design changes pigment, not the physical shape.