Crisp & Refined with utmost attention to stitching & detail. RIB fabric used exclusively to provide utmost style, comfort & sleek contours -- providing unlimited range of motion for exercise like Yoga, while maintaining shape. The Sustain Tank is designed & hand-made in Los Angeles from a custom Modal fabric -- softer than cotton while more durable & colorfast - this tank will last for years! NO side-seams to interfere with your workout! The only seam is down the center of the back in bamboo green thread.