I take bikram yoga at least 5x a week. I have several of these skidless mats all in the same color. I wash them separately from other items in cold water & there is no bleeding. The nubs go down & since there is no jumping around in bikram the issue of slidding/slipping doesn't occur. Towards the end of class the mat bunches up a few times at the corners. However, the chance to fix it buys me time to get in the posture.