IST Sports 'Corona' Dual Lens Clear Silicone Mask.
Corona has been one of the most popular IST masks and its superior fitting and comfort are the reasons behind the success. Its swivel buckle allows the diver to adjust the mask to the most desirable position. The low internal volume gives unrestricted view.
OL-55 Optical lenses for M55 CORONA & M100 PANORAMA: Available in dioptre from -1.0 to -8.0 in -0.5 decrement or and from +1.0 to +4.0 in 0.5 increment. Left / right lenses are interchangeable.