Tilos Soft Hypoallergenic Silicone Snorkel Keeper for Snorkeling and Scuba Diving Soft hypoallergenic silicone. Silicone snorkel keeper stretches to fit onto snorkels of any shape and size. Tension reduction at the mask strap keeps the snorkel at the most natural and comfortable position during use. Excellent alternative to the traditional hard plastic snorkel keeper. Comes in Black or Clear.