Promate snorkel mask set for scuba diving snorkeling and swimming Package includes Promate Pro Slender purge mask (MK285) and Cobra dry whistle snorkel (SK680) 2-windows scuba dive (Rx-able) mask with purge function and channeled skirt design Mask buckles on skirt directly makes ...Promate snorkel mask set for scuba diving snorkeling and swimming Package includes Promate Pro Slender purge mask (MK285) and Cobra dry whistle snorkel (SK680) 2-windows scuba dive (Rx-able) mask with purge function and channeled skirt design Mask buckles on skirt directly makes swivel function more flexible and may fits a wide range of face shapes, compact size to fit limited space. The fully submersible dry top snorkel with one way purge valve Built-in whistle housing and Quick slip-in snorkel keeper Age Group: adult.