Full dry snorkel with automatic close/open sealing valve, operated by vitality plug. Soft non-toxic silicone mouthpiece, providing best comfort. Soft PVC air tube allows it to be folded at any angle. Thicker PC tube, more durable. Double silicone purge valves allow effective water clearance and prevent water from seeping inside. Cover outside to protect the purge valves. With clasp for easy fixing on your mask. Perfect for the novice to the experienced snorkeler.