Some important statistics

* In a consumer review of heated curlers, 87% of users said their lashes looked more lifted with a heated curler versus manual clamp curlers. 

* In a test of curl retention over time with heated curlers, one brand reported initial “curl %” of 95% at hour 2, dropping to 80% at hour 8. 

* According to one source, curls achieved with controlled warmth (heated curler) retained ~40% more lift than curls created by pressure alone (traditional clamp). 

* Duration of curl hold: Heated curlers reportedly deliver 8–24 hours of curl retention depending on lash type, heat setting and mascara used; traditional clamp curlers often provide 2–6 hours hold. 

* Market/consumer behaviour: Around 39% of users report dissatisfaction due to breakage or low durability of traditional eyelash curlers.