Washed Size: 41 - 42 (8 - 9 US) 4 pairs - Gray 1 pair - Black Stays on and stays invisible. The Falke Step Invisible No Show Socks are perfect to wear with summer shoes. Knit with an innovative method, these socks are comfortable and the perfect fit. Skid-proof thanks to an anti-slip system with optimized silicon at the heel and anatomically adapted heel shape. * Made from 98% cotton, 2% elastic