perm exothermic resistants red bOligo Permanent Exo Wave Resistant Hair Mature hair also gets well defined and long lasting curls thanks to Oligo's exothermic perm, created especially for white and gray hair. Formulated without ammonia and thioglycolate, this perm does not attack the hair fiber and minimizes the damage caused by this type of technique, especially on mature hair. Oligo perms will allow you to create soft and bouncy curls, whatever the hair type. Thanks to their low