Nemo Snorkel Set: The Complete Gear for Your Next Underwater Adventure Browse our Nemo Snorkel Set from over under fun and get leak proof, easy to fit snorkel masks. Shop now! WARNING: This mask is designed for adults only. This product is intended for recreational snorkeling use only and not for horseplay, diving, jumping, or anything other than regular snorkeling/diving usage. DO NOT let children use this mask.