The SpearPro Deep Mask is a super low volume silicone dive mask. Toe-to-toe, the SpearPro Deep Mask may be the most economical low volume freediving/spearfishing dive mask on the market. The internal volume is only about 3.97 cubic inches (65 cu. cm) making it one of the lowest volume masks in the market. The mask's design does not sacrifice peripheral vision thus making it ideal for spearfishing and freediving at any depth. This is the ultimate freediving mask.