The Zoom Snorkel Series has been developed by Omer's technicians, specifically for Spear Fishing and Free Diving. The shape of the silicone mouthpiece and the air tube has been ergonomically designed to follow the profile of the spear fisherman's face, to greatly reduce its visibility during the dive. The internal diameter of the tube is 0.8" (20 mm), a specific dimension to optimize the air flow rate. The tube of the Zoom Pro is manufactured in Thermoplastic Urethane (TPU), an extremely flexible plastic material with a high mechanical strength. The tube will undergo no swelling in water and won't yellow under the action of UV Light. The snorkel has a high rebound elasticity and "Snappiness", allowing the diver to fold it when it is not needed, and to take it out whenever the use of a snorkel becomes a necessity. Covered by a 24 month limited warranty.