EVOLUTION 4 Non-Reinforced Surgical gowns, our trusted standard SMS gowns, are extremely comfortable and provide the right level of protection for shorter, less fluid-intensive procedures. Look for the yellow neck band on all EVOLUTION 4 Surgical Gowns. EVOLUTION 4 is also available in a fabric-reinforced gown, for procedures with more moderate fluid exposure. EVOLUTION 4 surgical gowns meet AORN standards for fluid, flame- and lint-resistance.