Aqua Lung Impression Double Lens Dive Mask Using Micromask technology, the Impression?s, lens, skirt and frame are molded together in one shot as opposed to other masks where multiple pieces are snapped together. This allows the lens to come close to the face which maximizes the field of vision. Low volume means that the mask is easier to clear and reduces the buoyancy Advanced Fit Technology (AFT) uses bands of different textures around the edge of the skirt resulting in a superior seal against the face The mask skirt goes further back on the face increasing the contact surface between face and silicone skirt. This enhances the comfort and reduces the marks left behind on the face