EASYBREATH Innovation Snorkelling Mask (Blue, S/M) Innovative Product:Full mask for natural breathing through the nose and/or mouth. WIDE FIELD OF VISION:180 field of vision and shatterproof polycarbonate window for added safety. ANTI-FOGGING:Exclusive breath ventilation concept prevents fogging. IMPERMEABILITY / SEAL:Dry Top snorkel system stops water entering through the top of the snorkel. S/M:Recommended for women/teenagers; L/XL:Recommended for Men.