Medium Speed Vents provide a moderate intensity training of the respiratory muscles. These were provided as standard on all POWERBEATHER models up to 9th February 2017. If you purchased after that date the Medium SPEED VENT provides more breathing resistance.
This is a standard length – suitable for pools and calm open water.
For choppy water please see the SPEED VENT Medium Long
SPEED VENT RESISTANCE
SPEED VENT easy for relaxed, natural breathing while swimming or active snorkeling-diving.
SPEED VENT medium for a moderate intensity training of the respiratory muscles.
SPEED VENT power for high-intensity [strength/ tension] muscle training.