Amazing for running in cold weather
"Struggled with running in the cold weather after living in the tropics for 15 years, despite wearing beanie, gloves, wind proof jumper the cold air made it very difficult. The moment I started using it, it made my cold runs so much easier with no cold air getting into my lungs. Only problem is I am now so used to it, I still use it in the slightly warmer weather and get some strange looks :). It's very easy to breathe in and have not found it to hinder my breathing."