Tribord EasyBreath Full Face, Anti-Fog, Hypoallergenic Silicone Facial Lining, Atoll, M/L Exclusive breath ventilation concept prevents fogging. S/M is firstly suggested for almost all kind of people. M/L is for bigger people. Full mask for natural breathing through the nose and/or mouth. 180 degree field of vision and shatterproof polycarbonate window for added safety. Snorkel top can be seen from 4 times further away than a traditional Snorkel.