Simple silicone figure 8 snorkel keeper that fits on all adult snorkels ! The traditional snorkel keeper can keep your snorkel secure and solid on your mask. Also if your keeper breaks that came with your mask, it can be a challenge finding the propitiatory one that fits. The snorkel keeper conforms to fit your snorkel regardless of the shape.
A lot of people also use a snorkel keeper as an alternate air source holder too !!