Sigma Lambda Beta - Principles Shirt 1986 Brotherhood Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 50% Cotton, 50% Polyester Imported Machine wash cold with like colors, dry low heat Official Principles 101 Shirt Follow @greekdom101 on Instagram for more designs. Lightweight, Classic fit, Double-needle sleeve and bottom hem