This model has been designed specifically for those who practice free diving and underwater fishing. The tube is shorter and wider for better gas exchange (oxygen and carbon dioxide) and is made of a special new polymer that gives the respirator great elasticity. This allows it to be stored folded easily, and then return to its original shape immediately. Therefore, it is ideal for fishing in the hole! The mouthpiece is anatomical for comfort during prolonged use, and the material used for construction is hypoallergenic silicone.