Cressi Frameless Freediving Mask with Reduced Internal Volume and Ergonomic Nose ShapeUltra low volume mask, designed for passionate freedivers, and spearfishermen. It features a new innovative design by Cressi, an ergonomic shape of the nose, designed to facilitate equalization with the fingers. It has a frameless structure, that reduces the internal volume and increases flexibility, to adapt better to the face. It has a rigid co molded stiff core with the silicone skirt which integrates 2 tempered glass lenses shaped for increasing