Hollis M4 Mask meta-size-chart-fourth-element-dive-boots-size-chart which makes this mouthpiece incredibly

which makes this mouthpiece incredibly durable

Titanium alloy

Super stretchy - fits all body shapes

A Pro version of the tool is also available that has allen keys instead of the screw drivers

Hollis M4 Mask meta-size-chart-fourth-element-dive-boots-size-chart which makes this mouthpiece incrediblyThe Hollis M4 Mask is a perfect choice for a diver who value fit and field of vision above all else when choosing a mask. The M4 fits an amazingly wide variety of different face shapes and it offers a superior peripheral and vertical vision. The single lens is moulded directly into the silicone skirt for a lightweight frameless design that allows the mask to be folded virtually flat for stowing in a mask pouch or BCD pocket. The strap buckles are