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FLETHERMO is an infrared absorbing filament which produces and retains heat. The filament has a sheath-core structure, developed by utilizing composite spinning and kneading technologies, with a special infrared absorbing polymer kneaded in the core. FLETHERMO is a thermal material that facilitates temperature rise in clothing, by generating heat through infrared absorption and retaining any emitted heat.


  • Produces heat by absorbing infrared rays
  • Can be dyed into any color


Sportswear, inner wear, bedding, leggings, socks, agricultural nets, etc.