DUOFIL is made of High Tenacity Polyester Filament covered with cotton sheath during spinning, after which it is further twisted and dyed. KEY BENEFITS Strength of High Tenacity Polyester Filament and Softness and feel of Cotton on the seams High resistance to Heat No Problem of Melting of threads on high speed machines. Very high resistance to Abrasion High productivity due to excellent performance on sewing machine due to specially formulated micromolecular lubrication DUOFIL is available in wide range of shades