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The Mares X-Free Mask is specific designed for spearfishing or freediving as it is incredibly low volume which is a great feature. Made from a 100% black silicone, it give a soft seal everytime. The black silicone tunnels your vision which gives you a more focused line of sight so spearfisherman, freedivers and photographers will choose this mask.
The Mares X-Free mask has 2 very small tempered glass lenses which allow better vision and perception of distance. The side clips are super strong yet flexible so are durable. Being low volume means that there is less air inside the mask when being worn. When heading underwater, you need to equalize, this means you need to equalize the air inside your mask to prevent for mask squeeze. When on scuba diving, this is easier as we have spare air to use from our tanks, however when spear fishing, you are on breathe hold so you need less air in your mask so you don't use up too much breathe equalizing. This is why the spearfishing masks are low volume.
Another great feature to the X-Free for freedivers is the embossed grip area on the nose which allows you to put a nose clip on and not have it slip off. A very important item to have when freediving.