Breathe freely underwater with the Mares Sea-Vu Dry + Full Face Snorkelling Mask. It uses tech that minimises CO2 accumulation - helping you breathe clean, fresh air. The mask has large air flow sections and anti-water leaking technology to keep it sealed. It also gives you a beautiful crystal-clear view of the underwater world, with full vision capability and combined flat beds for a 3D effect without optical distortion.