OTS Guardian Full Face Mask The Guardian Full Face Mask is comfortable and is easy to use for anyone. The low profile visor ensures great visibility. The ABV valve helps preserve your air when on the surface. Diving becomes effortless especially in cold water. The Guardian helps keep your face warm and being able to breathe out your nose helps keep you from getting a dry throat, which is common for divers who have long duration dives. Women and men both found the mask to be extremely comfortable. In some cases, women who could not dive any other full face mask were able to easily dive the Guardian The mask bag was specifically designed for a full face mask. The design actually helps maintain the mask. The bag has large drain holes located on the bottom and a vent screen on the top. This helps in the drying process after diving. The Guardian was designed with a double seal, allowing for the comfort of both small and large faces.