The Michele Pimaformance stretch shirt is knit from Radmor's proprietary thirty-singles micro-pique, knit from a blend of Peruvian Pima Cotton Elastane yarns. Their ELS (extra-long staple) cotton, the smoothest in the world, is also the purest of cellulose fibers, and like all cellulose fibers, is biodegradable. This product reduces the impact on landfills everywhere at the end of its life cycle.