Earth - Eastside - Vegan (Mahogany Solestream) - Men's: The "Eastside-Vegan" slides on easily and stays on!; Tapered, stitched uppers sport a decorative snapped collar that doubles as an easy pull-on tab. Also, elasticized stretch gore strap and a subtle Earth embroidered logo complete the look. Vegan Society(tm) certified. Earth(R) features unique Negative Heel(R) Technology, which is the product of years or research by a celebrated Danish Yoga teacher, Anne Kalso(R). Anne Kalso discovered that positioning the heels below the toes naturally aligns the body, just like the Yoga Mountain pose. This natural posture and alignment relieves fatigue for people who are on their feet all day.