THIS PRODUCT IS A SINGLE-LENS, low-volume mask with a nose-pocket. The example supplied had a clear skirt, but other colour choices are available, including black.
The IST Pi Frameless provides a wide field of view, including downward vision, which is useful for seeing chest-strap releases, for instance. The skirt is unobtrusive, but does usefully increase your peripheral vision, so it feels good to use.
This is also a nice mask for photographers’ models to wear under water. I couldn’t detect any colour tint or darkening of facial images – some masks impart a green hue or make the face inside the mask look darker than the skin outside.
As this is a mono-lens mask, IST doesn’t offer off-the-rack eyesight-correction lenses. If you want to have this one corrected you’ll need to have custom lenses bonded to the glass.