MK-138 Xterra Scuba Max Professional Diving Mask. Small Fit two color sub frame design professional Scuba diving mask. MK-138 Xterra Scuba Max Professional Diving Mask. Small Fit two color sub frame design professional Scuba diving mask.Medium fitTwo color sub frame designAll directional easy adjustable bucklesSilicone skirt and strapTempered dual windows lensDouble edged facial seal for air tight comfort