Mares Octopus Loop Can be mounted on the right or the left side Freedom of movement in all directions "Under the shoulder" hose position Twin exhaust valves Integrated sagittal vad (s-vad) Oversized silicone purge button Material:Techno Polymer Total Weight (including hose): 374g Ultralight TechnopolymerAbrasion resistant and affordable, ideal for diving in warm and moderate water temperatures. VAD - Vortex Assisted DesignThe air bypass tube delivers air to the mouthpiece creating a swirling vortex with a low pressure area in the center that keeps the diaphragm down during inhalation,for very sensitive and easy breathing at all depths.