Isoplus Hot, Hot, Hot Thermal Curler by Isoplus. $3.99. Designed for use with curling and flat irons or heated rollers. Advanced, heat-activated spray. Enriched with body-building conditioners. Helps create curls that last and feel natural, never stiff or sticky. Hot, Hot, Hot Thermal Curler specifically for use with heated styling tools, such as curling and straightening irons.