I can't find much info about this mask.
How does it perform in freediving/spearfishing?
Link to the mask: http://pureinstinct.mares.com/products/masks-and-snorkels/masks/viper/7345/?region=eu
Video of some guy using it:
How does it perform in freediving/spearfishing?
Link to the mask: http://pureinstinct.mares.com/products/masks-and-snorkels/masks/viper/7345/?region=eu
Video of some guy using it: