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I have heard that it is supposed to simulate training at altitude, but that all it really does is limit your air intake, which is not good when you are training
If you want to train at altitude, it is best to do that naturally
But not by using a device.
Each to their own, I don’t judge people that use em
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2019 YMB ZCP convertible with Dinan Exhaust
2011 Ducati Diavel Carbon Edition
2015 BSM M4 Convertible - 2018-2019
2016 228Xi - 2017-2018
2003 Acura RSX Type S 2003-2017
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