An innovative thread that sews soft, secure, stretchable seams. For use in a conventional sewing machine, top and bobbin, no special stitches required. In an overlock machine, loops form smoothly for optimal stretch in performance sportswear. Colorfast. 225 yard snap spools. 27 wt., Tex 40 thread made from a continuous filament P.B.T. wihch is a form of polyester. Perfext for leotards, gym clothing, cosplay, swimwear, knit sportswear and stretch denum.