Nobody Knows More About Perms. Create shiny, long-lasting curls, waves and texture on all hair types with Robert de Soto iPerms. The Robert de Soto iPerm Acid Perm for Normal Hair produces fabulous natural looking curls for normal hair textures. Clients with thin, limp hair will be amazed by the perfect air-dried bounce which lasts all day. When it comes to perms, Robert de Soto has the right formulas with the right quality at the right price.