Bernhard Riemann (1826–1866) is widely regarded as one of the leading mathematicians of the nineteenth century. He developed Riemannian geometry which is the basis for Einstein’s theory of gravitation. He also developed important theories relating to complex analysis, real analysis, number theory, and mathematical physics. This reusable face mask will fit you nicely thanks to its adjustable nose wire and elastic bands. Choose a design that will complement your style, as face masks are becoming the new trend. • 100% supersoft polyester microfiber • Fabric weight: 2.4–2.5 oz/yd² (80-85 g/m²) • Nose wire that helps adjust the mask • Elastic bands with PVC earloop size regulators • Pocket for a filter or napkin • Washable and reusable

Size guide