Seamless leggings are proving to have some serious staying power. One reason for their meteoric rise in popularity is because they're designed to chafe less and have fewer places for stitching to dig into your skin do doing exercises that require lying on your sides. The fabric is not itchy whatsoever. The design hugs women's curves and hides imperfections really well. The seamless legging pieces are machine knit in a tubular. A seamless garment that has fewer seams and produces less waste to create, making it more sustainable.