This is the C4 Plasma Freediving and Spearfishing Mask All Color Options Features: PLASMA is a mask made in anallergic silicone and it is designed specifically for free diving and spearfishing. It features a wide field of vision and an extremely reduced internal volume. Mask Skirt made in 50°shA soft silicone with a variable thickness and matt internal finish. Anatomical adjustable silicone strap. Ultra resistant 3mm tempered glass. Polycarbonate buckles The field of vision of PLASMA has been optimized thanks to two factors: the geometry of the lenses and the reduced distance of the lenses from the eyes. This has been achieved by manufacturing the mask in a single piece.,/li> Plasma is a mask specifically designed for freediving and deep spearfishing. Plasma features an incredibly wide field of vision and extremely reduced internal volume. The geometry of the lenses positions the glass closer to the eyes and guarantees excellent visibility and a low inner volume.