The Mares Tana mask and snorkel set is made from 100% silicone and fits majority of adult faces. Designed for spearfishing, this mask is super low in volume. 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 dont use up too much breathe equalizing. The Tana Mask is a black silicone skirt aimed at Spear fishing, freedivers and photographers. This is due to the fact that black silicone tunnels you vision. When doing the above sports, you are concentrating on the single item, whether you are about to spear a fish or take that single photo of a small nudibranch. you do not need to be distracted with anything else. Maybe scuba divers will often opt for black silicone also, however, clear silicone is better for letting more light in when diving and snorkeling. The snorkel in the Tana set is a standard 100% silicone snorkel that is super comfortable in your mouth, especially when you have been using it for hours. The Mares Tana mask and snorkel set is a popular pick due to being such great quality at such an affordable price point.