Bas Rutten O2 Trainer (Green)

efectivo en la montaña a mas de 4500 mtssnm

Works just as advertised. Noticeable difference in how well I was able to breath in only a few days. It is built very sturdy as well. It looks like plastic but is actually made of some kind of silicone material. Shows a plastic nose clip; however the one I received was metal. Very happy with this product.

I let Bas know how awesome it works for me on social media; just had to give this thing props on Amazon too. It's that good. I am a lifter that's had circulatory issues for as long as I can remember starting with a deviated symptom and other issues I won't mention. Sometimes I use it on the treadmill, between lifting sets, and during. This alone has improved my ability so sing+scream heavy metal and hardcore. I can now hold notes significantly longer and felt a difference in my lung capactiy and entire diaphragm. This thing rules. Thanks again, Bas!

Super waste

Incredible. The cardio advantage you gain is immeasurable. If Bas Rutten says it, it must be so