This fabric is A MUST HAVE. Our model wearing them in the picture declared them "the most comfortable pants" she's ever worn. She actually took the time to email us her thoughts. See her complete comment below. This high tech fabrication feels amazingly soft and creates loads of comfort, but will not bag out easily. The paneling and color changes follow the natural curves and contours of your leg muscles resulting in a flattering look. Fabrication is 89% Polyester, 11% Spandex. MODEL COMMENTS: "Once I put them on, I didn’t want to take them off! They are, hands-down, by far, the most comfortable yoga pants I have ever worn. They’re soft to the touch and have a perfect amount of stretch to them - not so much that they’re loose, and not so tight that they’re stiff or constricting. They also have great breathability so that, while they may be long, they didn’t make me feel like I was ever going to overheat or be uncomfortable. I definitely recommend them!"