By Robert D. from Newhall, CA on 7/31/2011

If you already got the snorkel, this will give a more added pleasure. Works your cardiovascular conditioning to another level. I enjoyed the challenge of gasping for air but was able to overcome it after prolonged use. Now it just sits on top of my snorkel, and I do not even know if I can remove it. Recommend this!!

By Rob from MD on 10/18/2010

I recently bought this to add to my FINIS snorkel.  If you train for running swimming tri's this set up is great it will train you to function at a higher level on less oxygen.  So when you are actually running in a tri or just for fun you preform better with an abundant amount of oxygen. I have noticed a lot of positives effects from using the snorkel and the cap has really helped my endurance all around

By Marissa from NY on 10/16/2010

Wow. When i first put this on my snorkel i was pretty much gasping for air after a 500. After about a weeks use though, it gets easier and does increase lung capacity. kind of hard to put on though. At lest it's not tape with holes poked in it anymore!

By Heather M. from Stoughton, MA on 9/24/2010

This thing is killer! I have been swimming for years and always wondered what it felt like to have limited oxygen like training at altitude. I think this is great. I would recommend it to serious swimmers who are already fit and looking for that little edge.

By Andrew W. from Plainfield, IN on 7/27/2010

It was a bit wierd to put it on the snorkel but once I got it on it stays on even in my bag with all my other swimming stuff. You don't really notice a huge difference right away but once I got into a longer set I started wondering why it was harder to breath and didn't remember having it on until that moment

By Edward M. from San Juan Capistrano, CA on 6/15/2010

I have started training with this cap 3 wks ago and I can feel a difference in my swim as well as when I am running.  I would try to run with this snorkle on if I wasn't so vain.