You control the exact temperature of the hair appliance, in turn reducing damage to hair caused by heat. Thin, fine or fragile hair doesn’t need ultra-hot temperatures that thick or coarse hair needs. As a guide, fine or fragile hair is best suited to temperatures up to 180˚C, medium length or naturally wavy hair up to 200˚C and thick, ultra-long, coarse or curly hair types up to 230˚C.