Can I use my full face snorkel mask?

Although we understand that many people prefer to snorkel with a full face snorkel mask (also known as a Easybreath mask or Ninja mask), it is regrettably not possible to use them here in Iceland as it is not possible to get them to seal around the hood that you need to wear. This would result in your mask constantly flooding with water, which would not be an enjoyable experience.