The shape of the skirt has been carefully designed to adapt to Asian facial structure. Versatile mask with low inner volume. Foldable buckles, micrometric quick adjustment with Easy Touch System with dual buttons. Highly adaptable anatomic skirt in Comfort High-Quality Silicone with differentiated thickness. Smooth Edges to increase comfort and avoid leaving lines on the face, even after prolonged use. The shape of the nose has been carefully designed to facilitate equalization. Optical lenses: options from -1.0 to -6.0 (0.5 increment) DIOPTERS: -1,0 D., -1,5 D., -2,0 D., -2,5 D., -3,0 D., -3,5 D., -4,0 D., -4,5 D., -5,0 D., -5,5 D., -6,0 D. @ RM 138 PER PIECE (IMAGE SHOWN IN PAIR) PLEASE MESSAGE US YOUR LENS POWER WHEN PURCHASE POWER LENS (E.G.: LEFT -2.0, RIGHT -3.0) IN ORDER FOR US TO INSTALL THEM CORRECTLY Frame: polycarbonate Skirt: Hypoallergenic Comfort Silicone with differentiated thickness in a version for more slender faces Strap: silicone Lenses: symmetrical in tempered glass Optical lenses: options from -1.0 to -6.0 Packaging: transparent rigid box included.