W WSTOO Full Face Snorkel Mask Adults,Suitable for Beginners Dry Top Snorkeling Gear,Can Your Mouth or Nose to Breathe,180 Degrees Panoramic View,Anti-Fog Anti-Leak,Summer Travel and Vacationing Gifts

Preparation:Make sure there is no sand on the mask or tube,if there has sand,using water to clear the breathing tube or mask,once the mask is clean then it ready for use.Checking the seal:Pull the str...