Promate Snorkeling Scuba Dive Mask and Snorkel Combo Set Package include Promate Sea Slender Mask (MK275) and Cobra Dry Snorkel (SK680) Two windows snorkel mask with temper glass and high quality silicone for safe and confort Mask skirt design to offer effortless equalization and comfortable fit 100% submersible dry snorkel with one way purge valve keep water out easily Whistleblower on the bottom of snorkel for signal