... you warm in winter and cool in summer PTT elastic fibers The intrinsic content of the unique microstructure Fineyarn ... is soft and has excellent drape.PTT fabric with comfortable elastic (superior to polyester PET, poly (butylene terephthalate) PBT ... natural fibers, synthetic compound, producing carpets, plain clothes, fashion, underwear, sportswear, swimwear and socks. PTT elastic fiber fabric