OT: has anyone else got an ad for a full face snorkel mask on their pages? I only ask because it is the first time I have seen that invention and I have to say I instantly want one! Such an awesome idea to have a full face mask with built in valves to ensure that water doesn't get down the snorkel even when submerging. While I only have occasion to snorkel once a year (at best), I am pretty sure that this new mask design will be purchased for my next outing.