The ultimate freediving mask, the, dual lens STEEL COMP is particularly well-suited to deep diving. It has the lowest possible internal volume so equalizing is easy. Plus, on descents the mask itself compresses, so equalization is not required as often. The black and white skirts are both very effective at blocking out light reflection at depth, while the clear skirt allows a lot of light in when diving in darker waters. The soft skirt and buckle system allow for a comfortable, watertight fit on most faces.