Proyog Women's Organic Yoga Tank 92% Organic Cotton 8% LYCRA elastane This round neck, sleeveless tank comes with a longer shaped back and shifted seams. 92% Organic Cotton | 8% Elastane (LYCRA Fiber) Proyogs HYPERBREATH () fabric is a proprietary blend of organic cotton and LYCRA fiber. To ensure that your skin comes in touch only with organic cotton, we use core-spun technology to knit the LYCRA core yarn with organic cotton sheath, to guarantee 100% opacity. The fabric is moisture-wicking and stretchable. The seams in this tank have been reinforced and flattened to prevent chafing.