Large dimension range. Comfortably fits a wide range of head sizes. 17% more adjustable than earlier versions. Steel-wire construction with padded headband and precision micro adjustments designed for just the right fit around the ear. New unique memory foam that combines denser and softer foam than previous models, for greater comfort and attenuation. Reduces squeezing pressure on the head and enhances comfort. An oil-resistant cup surface to withstand oily, heavy-work environments and frequent cleaning. ABS molded with internal baffle design for lighter weight, patent pending. Ideal for workers with larger ears, or who wear hearing aids. Opening area of the cup increased by 16% over earlier versions.