Merino Rugby™, 100% Washable Merino Wool, 270 g/m2, 21 micronMerino Rugby™ is a 21 micron, midweight, 100% washable merino wool with jersey knit construction. With soft, fiine fibers, our Australian-sourced merino has a luxurious next-to-skin feel, is extremely breathable, wicks moisture and resists odor. 100% Merino Wool, 270 g/m2, 21 Micron.