Superlux's best-selling HD681 is introduced to the special edition HD681-AIR edition with a new soft high quality silicone ear pads. Silicone ear pads utilize the elasticity of the material, thinner and lighter, resulting in a better fit with air cushion function. Compared to traditional vinyl leather ear pads, it reduces side pressure, and the ear pads will conform to the shape of each ear and maintain sound isolation for long periods of time and comfort. In addition, you can expect improved bass leakage problems that have been difficult with vinyl leather ear pads by simply changing them into silicone earpads. (Traditional vinyl leather ear pads are attached to the product when opened. You can replace the silicone ear pads according to your preference)