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. Snorkel has an Easy-to-Use Snorkel Keeper, is available in 4 colors of Black, Mimetic Med, Ocean Mimetic or Mimetic Brown colors and is covered by a 24 month limited warranty.,,The Omer Zoom Snorkel is commonly used for Pool, Snorkeling, Spearfishing and more. The Omer Zoom Snorkel is most used by customers who consider themselves to be a Advanced among others. The Omer Zoom Snorkel is popular because customers like the following qualities of the Omer Zoom Snorkel: Comfortable Mouthpiece, Ergonomic Design.