Do plastic fiber fake eyelashes keep good shape?
Core Conclusion
Strong structural memory: PBT/PET plastic fibers are heat-set during manufacturing, so they keep their original curl and shape permanently.
Humidity and sweat proof: They will not droop, flatten or lose style even in hot, humid weather, or when exposed to sweat and oil.
Long-term style stability: The shape stays consistent across multiple wears, with no gradual deformation like some natural hair lash materials.