IST M37 PEGASUS Full Face Mask for Commercial Scuba Diving, Low Volume Gear with Octo Attachment (Black Silicone)Full face design: The mask covers the entire face, providing divers with a clear and unobstructed field of vision, including peripheral vision. Low volume: The mask has a low internal volume, minimizing the amount of air required for equalization and providing enhanced buoyancy control. Octo attachment: The mask features an octo attachment point, allowing for the attachment of an alternate air source for emergency situations. Durable construction: