Cressi Duke Dry Full Face Snorkeling Mask The Cressi Duke is a 100 % natural breathing full face mask. The Italian quality and innovative design provides a 30 % wider panoramic view so you see more sights on each adventure. Valveless breathing technology makes breathing a natural therefore more comfortable experience. Other features include stop fog deflector preventing the mask from fogging. Dry guard top mount snorkel keeps the splashing waves out whilst still allowing air out as well. The Duke provides an optimum snorkelling experience. IdealÂ for all ages and abilities and comes in Adult as well as Kids sizes.