This is the Hollis M4 Frameless Wide View Low Volume Scuba Diving Mask

Features:

• Frameless silicon skirt
• Rugged mask box and adjustable mask strap included
• Increased vision and low volume

When choosing a mask, fit and field of vision come first. The M-4 gives you the best of both worlds, fitting a wide variety of faces and offering superior peripheral and vertical vision. It is low profile, stows easy and carries an excellent value.