By changing the cross-sectional shape of the fiber, the fiber has permanent moisture-conducting and breathable grooves, which not only has a refreshing feeling, but also overcomes the dampness and uncomfortable feeling of traditional polyester wearing. It has been widely used in the field of knitting, and the finished products are used in underwear, shirts, sportswear and other fields, especially in the field of summer sports clothing. Specifications: 50D/48F, 75D/48F, 100D/48F, 150D/96F, 200D/96F and other DTY or FDY products with different specifications.